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373 Cards in this Set
- Front
- Back
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F-15
1. When a single antenna is used to transmit and receive, how is damage to the receiver avoided? |
1. A multipactor to used to protect the receiver.
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F-15
2. What two types of signals are primarily transmitted by the APG–63 radar |
2. The APG–63 radar uses high PRF (HPRF) and medium PRF (MPRF) primarily for transmission.
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F-15
3. Radar returns yield what type of information about a target? |
3. Presence, direction, range, and velocity are types of information that can be measured by radar.
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F-15
4. How is range to the target calculated? |
4. Target range is calculated measuring the time between transmission and reception of a pulse. The space between pulses is ―listening time.‖ If the space is long enough, as in a MPRF transmission, the echo returns to the antenna before the next output pulse is sent out, allowing a direct measurement of the time between transmission and reception.
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F-15
If the target has a lower frequency return rate, is the target getting closer or farther away from you? |
5. The target is getting farther away from you or opening. If the target range is opening, then the frequency of the return pulse is stretched out (lower frequency) and called a negative Doppler shift.
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F-15
6. List the major LRUs of the APG–63 radar set. |
6. Radar control panel (541), power supply (610), RF oscillator (001), transmitter (011), receiver (022), analog processor (039), data processor (081), programmable signal processor (042), antenna (031).
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F-15
7. Which LRU generates the basic RF operating frequencies for the radar set? |
7. The RFO (001).
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F-15
8. Which LRU amplifies low power RF (GTWT drive) from the RFO? |
8. Transmitter (011).
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F-15
9. The receiver amplifies the RF returns, converts them to 30 MHz IF signals, amplifies them again, and sends them to which radar component? |
9. Analog processor (039).
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F-15
10. What type of commands does the data processor (081) send to the power supply (610)? |
10. 031 positioning commands.
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F-15
11. What does the programmable signal processor (042) provide? |
11. The 042 performs target detection, filtering, range measurement, target parameter calculations, clutter canceling, and IFF (identification friend-or-foe) correlation. It also provides radar display parameters to the IG.
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F-15
12. Explain the purpose of the flood horn (019). |
12. It provides a backup, range-only tracking ability for gun attack. The data processor (081) can also command it to provide backup illumination for AIM–7 guidance after launch during certain conditions.
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F-15
13. Which LRU receives serial digital data from the CC and radar set, analog and discrete data from the radar set, and a composite video signal from PACS? |
13. PSDP.
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F-15
14. During the transmitting function, which component sends the frequency selection to the RFO? |
14. The 081.
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F-15
15. During the transmitting function, how does the RFO send the ―GTWT DRIVE‖ signal and to which component is it sent to? |
15. The transmitter through a waveguide.
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F-15
16. How does the APG–63 radar set filter out ground clutter? |
16. By using the guard horn, a small, wide-angle horn located at the bottom of the antenna, angled down slightly. It is a receive-only horn designed to intercept sidelobe echoes. With the ability to measure Doppler shift, we can use these ground returns to measure our ground speed. Knowing this, we can filter out all main-beam returns that come back to us with the same Doppler signature, as they must be just returns from the ground ahead. This process is called clutter rejection and occurs in the 042.
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F-15
17. The receiving function of the APG–63 radar is divided into what two broad categories? |
17. Search and track.
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F-15
18. Which component is the only LRU involved in the data processing function? |
18. The data processor (081).
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F-15
19. Which LRU is the only radar component requires liquid cooling? |
19. The transmitter (011).
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F-15
20. List the five assumptions the radar BIT makes? |
20. 1. Single fault concept.—BIT is designed to handle one fault at a time. Multiple faults are not accounted for.2. Maintenance is done as indicated.—BIT assumes fault indicators, ASP indicators, and BIT readouts/advisories were used correctly.3. Replacement LRU is serviceable.—BIT assumes that the new part works as advertised.4. Operator actions are taken where indicated.—fault isolation procedures in the TOs were followed exactly.5. External interfaces are correct.—BIT assumes that power, cooling air, and hydraulics are normal. Liquid coolant and waveguide pressure are within tolerance.
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F-15
21. When running an operate IBIT on the ground, what should be displayed in the BIT window? |
21. When IBIT is running on the ground, ―G-TEST‖ is displayed in the BIT window. If ―TEST‖ appears, the radar thinks it is airborne and will transmit.
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F-15
22. During which BIT are the faults detected by the radar displayed? |
22. Standby IBIT.
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F-15
23. What is the purpose of the indicator group? |
23. The IG is a video display system made up of the PSDP and the MICP. The IG converts both analog and digital input signals for displays. It is capable of displaying radar, TV, or miscellaneous displays as selected by the CC.
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F-15
24. Explain the HPRF operation of the APG–63 radar set. |
24. A HPRF radar mode provides maximum detection against nose-aspect targets. Its high average power results in long-range detection and tracking capability. (The close spacing of the pulses means the transmitter is ―on‖ a lot, compared to its listening time.) A problem with HPRF is that it has poor performance against tail aspect targets and near zero capability against targets with no closure rate. HPRF is available in all ranges except 10 NMI.
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F-15
25. What detection ranges are available during only MPRF operation? |
25. 10 through 80 NMI.
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F-15
26. If the pilot wants to continue searching for other targets while tracking another target, he can accomplish this by using which basic mode group? |
26. Track-while-scan.
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F-15
27. What is the primary A/A search mode and is used for detection and acquisition of both closing- and opening-rate airborne targets? |
27. Long-range search (LRS).
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F-15
28. What is acquisition and how can the pilot acquire a target? |
28. Acquisition is the process of picking out a target to track. The two ways to acquire a target are manually and automatically.
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F-15
29. During manual acquisition, what control is used to move the acquisition symbol around the radar display? |
29. The TDC on the right throttle grip.
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F-15
31. Which air-to-air mode symbol is a V shape that moves along the bottom grid line indicating antenna (031) azimuth position? |
31. Antenna azimuth caret.
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F-15
32. Which air-to-air mode symbol is a pair of vertical lines (captain’s bars) used to enable target sampling or acquisition by bracketing the target symbol? |
32. Acquisition symbol.
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F-15
33. What is a steering dot? |
33. A small dot with a cross superimposed over it that provides steering commands for attack.
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F-15
34. Which MRM range symbol indicates range at which the target cannot ―turn and run‖ to evade your missile? |
34. RTR .
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F-15
35. Why should an attack be stopped when ―Break-X‖ is displayed? |
35. Firing a weapon at this point could possibly cause an explosion that would damage your own aircraft with debris.
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F-15
36. Which air-to-air target symbol is a closed (colored in) box displayed on the MICP indicating target range and azimuth? |
36. Full intensity target.
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F-15
37. What information is provided to the pilot when the lock-shoot lights flash? |
37. It means that conditions have been satisfied for highest impact probability.
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F-15
38. Explain the air-to-ground ranging mode. |
38. The A/G ranging mode uses LPRF to determine the slant range from the aircraft to a ground point. It is used primarily for bombing/gun strafing.
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F-15
1. The F–15 C/D APG–70 radar set is made up of how many major LRUs? |
1. Eight.
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F-15
2. The receiver-exciter (025) combines the functions of which APG–63 LRUs? |
2. The receiver and RFO.
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F-15
3. Which APG–70 radar set major components use waveguides or are termed microwave LURs? |
3. The microwave LRUs are the 031, 111, and 025.
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F-15
4. Explain range gated high PRF. |
4. Range gated high PRF is an intermediate PRF that falls between HPRF and MPRF. The pulses are spaced a little farther apart than in HPRF, but not quite as far as in MPRF. This produces some of the desirable effects of both the old waveforms.
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F-15
5. When in the ―HI‖ air-to-air search mode, what range will the radar search? |
5. It will search in the 20, 40, 80, and 160 nmi ranges and it uses all high PRF.
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F-15
6. When in the ―MED‖ air-to-air search mode, what range will the radar search? |
6. It uses all MPRF to detect all-aspect targets from 10 to 80 nmi.
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F-15
7. How many air-to-ground modes are available and what waveforms do they use? |
7. There are four A/G modes available to the pilot and all of them use LPRF waveforms.
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F-15
8. Pilots will use the precision velocity update function prior to making a bomb run to compensate for what? |
8. To compensate for errors in INS velocities.
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F-15
10. List the five BIT history matrices available. |
10. ORT matrix, G–BIT matrix, F–BIT matrix, CM matrix, and FRESH matrix.
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F-15
9. What happens when a G-BIT is initiated with the radar power switch in ―STBY‖? |
9. The radar ceases all other functions, latches fault indicators, and displays the BIT matrices on the MICP.
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F-15
11. What action will display the BIT history matrices? |
11. Performing standby-initiated BIT will display the matrices.
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F-15
12. What control will cycle between the BIT history matrices? |
12. The AUTO-ACQ/REJ switch cycles between the five matrices.
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F-15
13. Explain how the persistence counter is used for fault isolation. |
13. A persistence counter tracks the number of CM-BIT failures. The failures are not used in fault isolation if their persistence count is less than seven in one minute.
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F-15E 1. Name the seven major LRUs of the APG–70. |
1. Transmitter (111), receiver exciter (025), power supply (610), analog signal converter (038), antenna (031), radar data processor (082), programmable signal processor (PSP) (044).
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F-15E
2. Explain the purpose of the RBM mode. |
2. RBM is used to provide a conventional mapping mode for low resolution ground mapping, weather returns or for HRM cueing.
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F-15E
3. Which LRU receives digital data and controls from the analog signal converter and the RDP? |
3. 044.
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F-15E
4. Which A/G mode is used for detection of trucks or convoys out to 32 nautical miles? |
4. GMT mode.
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F-15E
5. What does the HRM mode provide? |
5. A high resolution map for A/G weapons delivery.
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F-15E
6. What is the purpose of the SET function? |
6. The SET function provides a means for one aircrew member to continue to do A/G HRM targeting functions while the other crew member is operating the radar in an A/A mode or if the radar is automatically set to the AGR submode.
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F-15E
7. Explain the purpose for the PVU mode. |
7. Used to update the MN or INS.
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F-15E
8. What is the purpose of the PVU mode LAN/SEA function? |
8. Provides a normal PVU to include estimating azimuth and elevation pointing errors. LAN is selected when flying over land and SEA is selected to stop the system from estimating pointing errors.
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F-15E
9. What is the purpose of the ORT? |
9. Performs system tests and calibration on individual LRU and the entire radar set to establish a high level of confidence that the radar will do its mission satisfactorily.
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F-15E
10. When is CM testing performed? |
10. The CM testing is performed on a non-interruptive basis at end-of-frame and end-of-bar.
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F-15E
11. What is the difference between an FBIT and a GBIT? What determines whether an FBIT or GBIT will be performed? |
11. The GBIT is the maintenance BIT and FBIT is the in-flight BIT. FBIT is performed in the air, while the GBIT is performed on the ground.
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F-15
1. How will the BIT results from the radar get to the CFRS/CFI workstation in debrief? |
1. DTM.
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F-15
What computer system is used in addition to BIT to help achieve the contracted requirements for fault isolation in the APG–63(V)1? |
2. CFRS/CFI.
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F-15
3. Aside from pilot directed maintenance, are you allowed to deviate from the BIT and CFRS/CFI instructions? |
3. NO! Any deviation could void the equipment warranty.
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F-15
4. What are the seven major LRUs in the APG–63(V)1 radar? |
4. Radar control panel (342), receiver/e (325), transmitter (311), analog signal converter (338), radar data processor (385), power supply (310), and antenna (031).
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F-15
5. What new 311 feature makes transportation of the part easier? |
5. Coffin handles.
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F-15
6. Where is the APG–63(V)1 radar OFP stored? |
6. RDP (385).
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F-15
7. BIT for the APG–63(V)1 is divided into what two modes? |
7. Automatic and Initiated.
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F-15
8. What type of BIT is started when the radar is switched from OFF to STBY? |
8. Power on self-test (POST) when executed at ―Standby Cold start.‖
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F-15
9. What type of BIT is started when the radar is switched from OFF to OPR or EMERG? |
9. POST when executed at ―Operate/Emergency Cold start.‖
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F-15
10. What will be displayed when running an IBIT with the power switch in STBY. |
10. The BIT matrices will be be displayed.
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F-15E
1. Where is the CARA R/T located? |
1. In door 149.
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F-15E
2. What is the voltage requirement for the CARA system? |
2. 28 VDC from the left bus circuit breaker panel.
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F-15E
3. Where is the radar altimeter switch located? |
3. On the sensor control panel.
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F-15E
4. What is the RDR ALT switch OVERRIDE position for? |
4. It is used when the radar altimeter is disabled and allows manual TF operation when radar altimeter data is known to be incorrect.
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F-15E
5. What is the operating range of the CARA system? |
5. 0–50,000 feet above the ground.
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F-15E
6. How does the CARA system measures the aircraft’s altitude? |
6. The CARA system transmits a FM/CW RF to the ground. A portion of the transmitted RF energy is reflected from the surface below the aircraft. The receiver computes the altitude and altitude status based on the signal travel time.
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F-15E
7. What LRU is responsible for supplying CARA altitude to other aircraft avionics systems? |
7. ADCP.
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F-15E
8. What LRU is used to enable the LAW function? |
8. The UFC.
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F-15E
9. How many times will the LAW voice warning be heard for a single low altitude incident? |
9. Two times.
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F-15E
10. What effect does the spin recovery aid have on the CARA system? |
10. The Spin Recovery Aid Display is automatically displayed on all of the MPD/MPCDs and the LAWS changes its present altitude to 10,000 feet.
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F-15E
11. What CARA functions are available in the backup mode? |
11. All except LAW.
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F-15E
12. List the different types of BIT that the CARA system provides? Explain each. |
12. Periodic and initiated; Periodic BIT is activated at power application and occurs two or three times every second. The initiated BIT is activated by the MPD/MPCD by pressing RALT/LANT on the BIT display and lasts approximately two seconds and interrupts operation and checks all circuitry.
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F-15E
13. What is the purpose of the AIU in the CARA system? |
13. The AIUs process UFC data and converts ADCP commands to discrete data for the CARA R/T. It also routes a CARA status signal to the ADCP if the MUX line fails.
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F-15
1. List the five major components of the CC complex. |
1. (1) CC.(2) H009 MUX bus.(3) 1553 MUX bus.(4) DTM receptacle.(5) MLV receptacle.
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F-15
2. What are the three aircraft avionics master modes? |
2. (1) A/A.(2) A/G.1–91(3) ADI.
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F-15
3. What is the primary master mode of the A through D models of the F–15? |
3. A/A.
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F-15
4. What master mode provides aircraft altitude and steering information to the selected destination? |
4. ADI.
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F-15
5. What is the purpose of the DTM receptacle? |
5. To provide an interface between the DTM and the PSDP in order to load mission data into the CC.
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F-15
6. On the F–15A and C model, what components can be loaded using the PLV/NT via the MLV receptacle? |
6. The CC and the band 3 oscillator.
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F-15
7. What are the two types of MUX buses? |
7. H009 and 1553.
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F-15
8. What peripherals talk on the 1553 MUX bus on the A through D models of the F–15? |
8. F-100-PW-220 engines, radar data processor, PSDP, low band receiver/processor, INU, and band 3 oscillator.
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F-15
9. What MUX bus and which channels does the INU use to communicate with the CC? |
9. The 1553 avionics MUX bus (5A/5B).
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F-15
10. What are the five different types of modules contained in the VHSIC CC? |
10. (1) DPM.(2) IOM.(3) BMM.(4) BSM.(5) TDM.
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F-15
11. What is the input power requirement for the CC? |
11. Three-phase, 115 VAC, 400-Hz.
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F-15
12. Explain what happens if H009 MUX bus 1 or 2 fails. |
12. If MUX bus 1 fails, 3 takes over; if MUX bus 2 fails, 4 takes over.
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F-15
13. H009 MUX bus 1 links the CC with what systems? |
13. ADC, AHRS, NCI, HUD data processor, RWR system, and on some aircraft the internal countermeasures system.
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F-15
14. H009 MUX bus 2 links the CC with what systems? |
14. FDA, indicator group, PACS, and radar data processor (081).
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F-15
15. What must a peripheral receive before it communicates with the CC? |
15. The correct select word from the CC.
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F-15
16. What type of wire is used in the 1553 MUX bus and what is the data transfer rate? |
16. Each 1553 MUX bus channel has a twisted shielded pair of wires that carries the digital signals at a 1 Mb/sec rate to and from the peripherals.
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F-15
17. What are the three types of words used on a MUX bus? |
17. Command, status, and data.
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F-15
18. How does the CC monitor the status of the MUX buses? |
18. By analyzing its ability to communicate with each peripheral.
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F-15
19. What unit develops the avionic status word? |
19. FDA.
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F-15
20. What does the avionic status word generated by the FDA contain? |
20. The status of all peripherals on the MUX buses.
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F-15
21. Describe the DTM. |
21. It’s a programmable, battery powered, nonvolatile memory device that transfers flight operations mission data to the CC.
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F-15
22. What are the two types of DTMs? |
22. MAINT and OPS.
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F-15
23. What component does the DTM interface with? |
23. PSDP.
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F-15
24. What component provides a user interface for the DTM and what is the name of the screen that provides the DTM option? |
24. The MPCD, the master menu.
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F-15
25. What data sets are displayed when using the DTM directory function? |
25. One CC data set and one or two PSDP data sets.
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F-15
26. What is the DTM READ function? |
26. The process of the CC reading data from the DTM.
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F-15
27. What is waypoint data, and how many waypoints can be loaded into the CC? |
27. Steer-to points or target points for a specific mission; 30.
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F-15
28. How many data types are associated with a PSDP data set? What are they? |
28. Two. Reference lines and default parameters.
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F-15
29. How many data types are transferred onto the DTM during the WRITE function? |
29. 15.
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F-15
30. When is A/G engagement data recorded in the CC? |
30. When the CC detects a weapon release or a trigger switch second detent activation while the aircraft is in flight, with A/G mode selected.
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F-15
31. When is OWS data recorded in the CC? |
31. When the CC detects an over-g (G forces greater than the calculated maximum allowable are reached).
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F-15
32. What type of data written to the DTM consists of 100 words of data that identify failures occurring during a single sortie? |
32. The RWR BIT log.
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F-15
33. What DTM transfer status display comes up if some data is transferred but some is missing? |
33. PARTIAL XFER.
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F-15
34. What does the DTM status message DTM READ IN PROGRESS mean? |
34. A READ function has been initiated, but not completed.
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F-15
35. What information does the OFP contain? |
35. Instructions necessary to do radar, general navigation, and weapon delivery computations.
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F-15
36. What program functions are included in the OFP? |
36. Executive, A/A, A/G, navigation, flight director, controls and displays, and self-test.
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F-15 |
37. All other program functions. |
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F-15
38. What is the purpose of the A/A function? |
38. To assist in management and delivery of air-to-air weapons; receive radar data to assist in target tracking and display of target data; provide data for steering and displays; do computations; display HUD cues for gun mode operations (providing lead angle); and provide missile prelaunch and post-launch management.
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F-15
39. What tasks are performed by the flight director function? |
39. Provides TACAN, NAV, and ILS steer mode processing for display on the HSI. It also performs range and bearing or steering computations for display on the ADI and HUD in TACAN, NAV, and ILS steering modes.
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F-15
40. What are three functions of logic diagrams? |
40. To show what inputs the CC uses from other LRUs and how outputs are produced by stored/computed parameters; to identify which alternate inputs are used if a primary system fails.
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F-15
41. Where in a logic diagram can you find module name, figure title, reference code, and figure number for a calling routine? |
41. The return point.
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F-15
42. Where is the subtitle of a logic diagram located? |
42. At the bottom of the figure.
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F-15
43. Explain how the CC can be used for troubleshooting the avionics systems. |
43. By examining the CC I/O memory data and the internal memory parameters of the CC database.
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F-15
44. How do you decode an octal word? |
44. Convert it to a 16-BIT binary word and then use tables from TO 1F-15A-2-31GS-42-1 to extract its information.
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F-15
45. Where is information in the CC memory displayed? In what form is it displayed? |
45. The right DRD window of the NCI; octal.
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F-15
46. Where can you find the memory address of the input or output word you want to call up? |
46. In the input and output data tables contained in the TO.
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F-15
1. What is the purpose of the OWS system? |
1. To calculate the structural loads being applied to the aircraft.
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F-15
2. List and give a brief description of the OWS component(s). |
2. OWS Reset Switch—a two position momentary toggle switch in the NLG wheel well; it clears the matrix.
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F-15
3. List and give a brief description of the two main LRUs associated with OWS. |
3. CC—Digital computer that contains OWS software and performs the calculations. PSDP—A display processor that inputs various system parameters, formats them, and sends them to the CC to be used in the OWS calculations. Also processes OWS information to be displayed on the MICP.
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F-15
4. How many inputs does the ADC give the CC? |
4. 4 inputs: AOA, Mach #, pressure ratio, barometric corrected altitude.
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F-15
5. What part does the MUX buses play in OWS? |
5. It allows the CC to communicate with the ADC, PACS, HUD, and PSDP.
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F-15
6. Explain the purpose of the accelerometer for the OWS system? |
6. Measures the current G force on the aircraft and sends it to the CC.
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F-15
7. When will the pilot hear over stress warning tones? Describe these tones. |
7. A 900 Hz tone interrupted at 4 Hz rate when 85-92 percent max allowable load. A 900 Hz tone interrupted at 10 Hz rate when 92–96 percent max allowable load. A 900 Hz solid tone when 96–100 percent max allowable load. Voice warning when 100+ percent max allowable load.
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F-15
8. What row of the OWS matrix shows the worst overload condition for each column? |
8. 1st row.
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F-15
9. During normal operation, what display will the pilot see for OWS and what does it display? |
9. The HUD window 8 display is the only OWS display the pilot will see and it will show current Gs and the maximum allowable Gs. If the maximum allowable Gs cannot be computed for any reason, then window 8 will display the current Gs and NOWS.
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F-15E 1. What did TCTO 1F-15E-807 change in the F–15E aircraft? |
1. Removed the CC and MPDP, replaced with the ADCP.
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F-15E
2. Where is the ADCP located? |
2. Top left shelf of door 3L.
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F-15E
3. What components make up the ADCP? |
3. The GPP. The IPM. The VME64 main and essential busses.
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F-15E
4. What are the four modes of ADCP operation? |
4. Normal, Degraded, Emergency Power, and Test.
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F-15E
5. Explain the degraded mode of operation. |
5. Simple failure detected and stored in the bridge module’s fault log. Bus split—functioning bus automatically selected. Bridge module failure—ADCP operates on the main bus.
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F-15E
6. What are the four types of BIT tests? |
6. Power-up, background, maintenance, initiated.
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F-15E
7. Which BIT format does not interrupt normal operation? |
7. Background BIT.
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F-15E
8. Which MUX Bus does the Fighter Data Link operate on? |
8. MUX 7A/7B.
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F-15E
9. The EGI receives time of day, date, almanac data, initialization data, wander angle, barometric altitude, and position updates on which MUX bus? |
9. MUX 8A/8B.
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F-15E
10. List the program functions making up the ADCP OFP. |
10. Executive, A/A, A/G, NAV, FDL, controls and displays and computer self test functions.
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F-15
1. What data does the HUD symbology provide? |
1. Attack, navigation, aircraft attitude, and mode data.
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F-15
2. Which unit provides the symbology drive signals for the HUD DU? |
2. HUD data processor.
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F-15
3. What component converts symbol drive and unblanking signals to a visual image? |
3. The CRT.
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F-15
4. What’s the basic attack mode of the F–15A through D? |
4. A/A.
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F-15
5. Which aircraft mode displays symbology to aid the pilot in landing the aircraft? |
5. ADI.
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F-15
6. In what mode does the HUD operate if the CC should fail? |
6. Secondary mode.
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F-15
7. Explain the operation of the HUD when the CC is inoperative. |
7. The HUD set automatically switches to the secondary mode and displays the symbology of the A/A gun mode and the HUD data processor receives its inputs directly from the INS, AHRS, and radar.
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F-15
8. When does the aircraft symbol appear on the HUD combining glass, and what does it resemble? |
8. When commanded by the CC during A/A missile and ADI modes. It also appears during the A/G mode if the velocity vector data is defective. If the CC fails, then the HUD set automatically turns on the aircraft symbol; it resembles the letter W.
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F-15
9. Explain what the A/G reticle consists of and the purpose of each element. |
9. It’s made up of a 50-milliradian circle that is a reference for locating the pipper on the combining glass assembly, a range scale that is the reference for the range bar and is made up of points at 30 degree increments around the reticle circle, a range bar that indicates radar range-to-target, and a range index at the end of the range bar to locate the range bar past the 12,000-foot position.
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F-15
10. When is the A/G TD symbol displayed? |
10. During all A/G modes, except in the MANUAL mode.
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F-15
11. What is the purpose of the azimuth steering line? |
11. Referenced with respect to the velocity vector, the azimuth steering line is used to aid in directing the aircraft to the target.
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F-15
12. What’s the purpose of the A/A gun reticle? |
12. The A/A reticle is used as a reference for the pilot to aim the F–15’s 20 mm gun.
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F-15
13. When is the standby reticle used? |
13. When the A/A or A/G reticle is missing because of CC or HUD set failure.
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F-15
14. What does a vertical scan line do? |
14. To indicate where the radar antenna is scanning.
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F-15
15. When is the shoot cue displayed? |
15. During MRM or SRM, or in SRM/GUN combined mode when the correct launch conditions exist.
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F-15
16. What information does the ASE circle provide and when is it displayed? |
16. A steering reference during the A/A missile mode only.
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F-15
17. What’s the purpose of the Break X symbol? |
17. To indicate when the attacking aircraft is too near the target and should break off the attack to avoid damage caused by debris from the target aircraft.
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F-15
18. When is the SRM FOV reference circle displayed? |
18. During SRM in the boresight, vertical scan, or supersearch automatic acquisition modes.
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F-15
19. When is the SRM seeker position symbol displayed and what does it indicate? |
19. During A/A-SRM mode and it indicates the direction the AIM–9L/M missile-seeker head is pointing.
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F-15
20. What’s the main purpose of the velocity vector? |
20. To display the aircraft flight-path angle.
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F-15
21. What does a flashing velocity vector indicate? |
21. That the data to the CC is degraded or the velocity vector is caged in the ADI mode.
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F-15
22. What data does the flight director symbol provide? |
22. Steering data during ADI mode.
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F-15
23. When is the AOA scale displayed? |
23. During the ADI mode.
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F-15
24. What’s the purpose of the pitch scale? |
24. To provide a ±90 degree pitch reference and a 0 through 360 degree roll reference.
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F-15
25. What’s the purpose of the command heading index? |
25. To provide command heading data to the ground target destination.
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F-15
26. What’s the purpose of the airspeed scale? |
26. To provide airspeed data during A/A, A/G, and ADI modes.
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F-15
27. How does the airspeed scale operate? |
27. The airspeed scale and digits move vertically, against a fixed caret (<) index, increasing in value from top to bottom of the scale. A readout pointer is positioned at the center of the airspeed scale to indicate airspeed.
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F-15
28. What’s the purpose of the altitude scale? |
28. To indicate altitude during the A/A, A/G, and ADI.
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F-15
29. What is the resolution of the altitude scale when the landing gear is lowered? |
29. 20 foot increments with five digit readouts every 100 feet.
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F-15
30. Primarily, which unit sends signals to the HUD set? |
30. CC.
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F-15
31. What action does the HUD data processor take if the CC-go signal is missing? |
31. Switches to the secondary mode, receiving data directly from the radar, INS, and AHRS.
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F-15
32. The HUD uses the signals from what systems for symbol positioning during secondary mode? |
32. Radar, INS, and AHRS.
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F-15
33. The HUD set displays what scale and symbols in the secondary mode? |
33. Pitch scale, A/A reticle, aircraft symbol, and gun-cross symbols.
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F-15
34. What fixed range is used in the secondary mode when radar range is not available? |
34. 1,000 feet.
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F-15
35. The symbol reject signal prevents the HUD from displaying what data? |
35. Heading, airspeed, altitude, pitch, AOA and in A/A, the velocity vector.
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F-15
36. What does the reticle depression control signal vary? |
36. The vertical position of the A/A, A/G, and standby reticle.
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F-15
37. The HUD tilter consists of what data? |
37. Mission, wing, aircraft, and local-use coded data.
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F-15
38. What two light levels are compared by the automatic brightness circuits? |
38. CRT light level and ambient light level.
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F-15E 1. Where does the HUD unit receive its symbol drive and unblanking signals from? |
1. The ADCP.
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F-15E
2. What do the controls on the front of the HUD unit provide? |
2. The ability to turn on the HUD unit, adjust symbol/raster video brightness, control some of the symbols and select Master Modes.
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F-15E
3. What LRU is used to initiate a HUD BIT or to program the HUD? |
3. Any MPD or MPCD can be used.
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F-15E
4. What is the function of the ADCP in the HUD system? |
4. The ADCP processes all video and display symbology for displays on the HUD and MPD/MPCD. The ADCP provides mode control and display computations for the HUD.
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F-15E
5. The backup bus controller for the up-front control is which component? |
5. The AIU no. 2.
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F-15E
6. The UFC provides what function to the HUD system? |
6. The UFC is used to display true airspeed, groundspeed, and radar altitude on the HUD. The UFC also provides a HUD UPDATE menu.
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F-15E
7. What is the HUD systems primary mode and what controls the mode? |
7. The primary mode is the normal operating mode which is controlled by the ADCP.
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F-15E
8. In which mode will the HUD not be available? |
8. Emergency Power Mode.
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F-15E
9. Which option enables the symbology on the HUD to be displayed on any MPD/MPCD? |
9. HUD repeater.
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F-15E
10. Where is the heading scale located on the HUD? |
10. It appears at the top center of the combining glass assembly.
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F-15E
11. Explain the vertical scan line. |
11. The vertical scan line extends up from the aircraft symbol to the top of the display. The vertical scan line appears during A/A vertical scan modes and indicates where the radar antenna is scanning.
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F-15E
12. Which symbol is square and is superimposed over the target the radar is locked on? |
12. A/A TD.
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F-15E
13. Where is the ASE circle located on the HUD? |
13. The ASE circle is displayed centered on the aircraft symbol.
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F-15E
14. Which symbol is a vertically positioned triangle symbol and is displayed during MRM or SRM modes when the correct launch condition exists? |
14. A shoot cue.
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F-15E
15. Which symbol is made up of a 50 milliradian circle, pipper, range scale, range bar, and range index? |
15. The A/G gun reticle.
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F-15E
16. What is indicated when the pull-up cue is coincident with or above the velocity vector? |
16. The pull-up cue indicates pull-up must be done to escape weapon blast.
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F-15E
17. How many HUD windows display alphanumeric readouts? |
17. 22.
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F-15E 1. What is the purpose of the multipurpose display system? |
1. The MPD System is designed to provide the F–15E pilot and WSO with a visual representation of information on flight, navigation, attack, target, and weapons, as well as advisory information such as warnings, cautions, and threats.
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F-15E
2. Which component within the ADCP performs the multipurpose display processing? |
2. The IPM.
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F-15E
3. How many MPDs are installed in the F–15E? |
3. Four.
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F-15E
4. Where are the MPDs installed on the F–15E? |
4. The two FCP MPDs are installed to the left and right of the main instrument panel. The RCP MPDs are installed in the left center and right center positions of the RCP instrument panel.
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F-15E
5. How do you know if a MPD is functioning correctly or it has failed? |
5. A ball-type BIT indicator remains black when the MPD is functioning correctly and latches white when the MPD fails.
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F-15E
6. How many MPCDs are installed in the F–15E? |
6. Three.
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F-15E
7. Where are the MPCDs installed on the F–15E? |
7. The single FCP MPCD is installed in the lower center of the main instrument panel. The two RCP MPCDs are installed to the left and right of the MPDs.
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F-15E
8. Which MPCDs is different? How? |
8. The FCP MPCD is wired to interface with the programmable armament control set (PACS).
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F-15E
9. When is multipurpose display system normal mode operation enabled? |
9. When aircraft power is applied and the ADCP is operational.
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F-15E
10. Which display format is not available on any MPCD? |
10. The A/G radar display format.
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F-15E
11. How does the front or rear cockpit crewmember take command? |
11. In the front cockpit, the pilot uses the stick grip castle switch. In the rear cockpit, the WSO uses the coolie hat switches on the hand controllers.
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F-15E
12. What is the maximum number of cautions that can be displayed on a MPD system? |
12. The maximum number of cautions that can be displayed is 48.
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F-15
1. Where is the display for JHMCS projected? |
1. On the backside of the helmet’s visor.
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F-15
2. Name the JHMCS LRUs. |
2. EU, CU, HVI, HDU, MTU, MRU, SPS and the HMD/VCP.
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F-15
3. What LRU performs the main processing functions for JHMCS? |
3. The EU.
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F-15
4. Name the functions of the EU. |
4. BIT test controller, graphics processing, helmet position calculation, LOS computations, video record display generation, MCD storage, power distribution to other JHMCS components and interfaces JHMCS with peripheral systems.
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F-15
5. What powers the CRT inside the HDU? |
5. The high-voltage power supply inside the CU.
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F-15
6. What safety features are incorporated into the HVI? |
6. Limited re-mate connectors and the short pin interlock on each of the male connectors between the CU and HDU.
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F-15
7. What is the name of the projection produced by the HDU? |
7. HMD.
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F-15
8. What HDU component(s) project(s) the display on to the back side of the visor? |
8. The CRT and the ROMA.
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F-15
9. Describe HDU camera. |
9. Monochromatic with a 20 degree FOV and an automatic brightness control.
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F-15
10. What information does the EEPROM in the HDU store? |
10. Fault and maintenance data storage.
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F-15
11. Where is the MRU located and what does it use to sense magnetic fields? |
11. Within the HDU; three coils.
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F-15
12. What information does the EEPROM in the MTU store? |
12. The same magnetic map information called the MCD that is stored in the EU.
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F-15
13. What does the SPS do? |
13. Senses the seat position in order to compensate for changes in the magnetic environment of the cockpit caused by different seat positions.
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F-15
14. What functions do the switches on the HMD/VCP perform? |
14. The PFF/BRT switch turns JHMCS off and on and adjusts display brightness, the NORM/REJ 1/REJ 2 switch allows the pilot to declutter the HMD and the switch labeled OFF/STBY/AUTO/HUD that allows for power application and video source selection to the VTRS.
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F-15
15. How does JHMCS communicate with the CC? |
15. Via the 1553 MUX bus 5A and 5B.
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F-15
16. In respect to JHMCS, how can the DTM convenience the pilot and aid avionics troops in trouble shooting? |
16. By quickly configuring JHMCS with declutter programming and mask selection preferences and by storing JHMCS BIT log data that may be helpful in troubleshooting a malfunction.
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F-15
17. List some of the JHMCS HOTAS functions that can be initiated from the control stick grip. |
17. JHMCS alignment, HMD blanking and helmet radar mode selection.
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F-15
18. List some of the JHMCS HOTAS functions that can be initiated from the throttle grip. |
18. JHMCS alignment, disabling uplook reticles on the HMD and missile seeker slaving.
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F-15
19. What purpose does the MPCD serve JHMCS? |
19. Facilitates the selection of JHMCS operating modes and functions.
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F-15
20. How is the JHMCS coarse alignment cross positioned on the HUD? |
20. At 0 degree azimuth and -2 degree elevation from the aircraft water line.
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F-15
21. What radar LRU provides the interface between JHMCS and the radar system? |
21. The radar data processor (081 APG–63 or 082 APG–70).
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F-15
22. What are the two categories of states for the JHMCS? List the states within each category. |
22. The operational state and the maintenance state. Operational states include: initialization, coarse align, fine align and the normal state. Maintenance states include: IBIT, error log display and MLV mode.
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F-15
23. What LRU controls the states of JHMCS? |
23. The CC.
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F-15
24. Explain the process of JHMCS initialization in relation to the system performing a cold start or a warm start. |
24. The EU monitors the state of the power interrupt discrete provided by the power supply inside the EU. If power has been removed from JHMCS for 250 ms or more, a cold start will be performed that can take up to 30 seconds. If the power interrupt discrete indicates power was interrupted for less than 250 ms, a warm start will be initiated that takes approximately one second to complete.
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F-15
25. Name one type of data that cannot be transferred from the CC to the EU during initialization, and why it can’t be transferred. |
25. MCD. Because MCD is not stored in the CC due to the large file size of the MCD.
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F-15
26. What is the main state of JHMCS? |
26. The normal state.
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F-15
27. Briefly explain the method JHMCS uses to track the helmet line of sight, position, and orientation. |
27. The MTU transmits electromagnetic fields that are received by the MRU mounted on the helmet. A signal that corresponds to the position of the helmet is sent from the MRU to the EU where it is used to calculate the helmets line of sight, position and orientation.
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F-15
28. What are metallic distortions? |
28. Metallic distortions are irregularities in an electromagnetic field caused by the presence of metallic structures and the positions of those structures.
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F-15
29. How do eddy currents cause distortion of the MTU’s magnetic field? |
29. By producing a secondary magnetic field that disrupts the MRU’s reception of the magnetic field transmitted by the MTU.
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F-15
30. Explain permeability distortion. |
30. Permeability distortion is caused when the MTU’s pulsating magnetic field is absorbed and redirected by surrounding metallic structures causing the magnetic field to bend and distort.
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F-15
31. How is metallic distortion corrected so that JHMCS maintains its accuracy? |
31. The EU is provided with magnetic properties of the aircraft cockpit(s).
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F-15
32. How long can the cockpit mapping procedure take? |
32. Eight to 10 hours per cockpit.
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F-15
33. When would a second mapping procedure be required? |
33. In the event of a canopy replacement or if the EU and MTU are replaced at the same time without transferring the MCD to the new components and no MCD for that particular aircraft exists for upload using a PLV NT.
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F-15
34. To avoid having to remap the cockpit or reload the MCD using a PLV/NT, what should you avoid doing? |
34. You should avoid replacing the EU and MTU at the same time.
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F-15
35. Why is the JHMCS alignment required? |
35. To orient the helmet’s display with the position of the helmet in the helmet motion box.
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F-15
36. Describe the symbology presentation during a coarse alignment. |
36. A fixed cross is displayed on the HUD and a helmet stabilized cross will be displayed on the HMD. All other symbology is removed from the HMD during the alignment.
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F-15
37. How will the pilot know if the alignment is successful or unsuccessful? |
37. ALIGN OK will be displayed on the HMD if the alignment is successful, and ALIGN FAIL will be displayed on the HMD if the alignment is unsuccessful.
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F-15
38. What is the purpose for the JHMCS fine alignment? |
38. To make fine adjustments to the X, Y and Z axes of the HMD.
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F-15
39. Describe the HMD symbology during a fine alignment. |
39. The HMD presents two-space stabilized fine alignment crosses with four edges of display segment lines along with the words FINE ALIGN.
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F-15
40. What is indicated by flashing fine alignment crosses? |
40. The HUD is outside the JMD field of view during a JHMCS fine alignment.
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F-15
41. What are the HOTAS commands for adjusting the HMD during a fine alignment? |
41. The TDC button on the right throttle grip is used to fine tune the alignment crosses in azimuth and elevation while the left throttle grip’s antenna elevation wheel is used to fine tune the alignment in roll.
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F-15
42. How does JHMCS indicate that the fine alignment was not successful or cannot be performed? |
42. The HMD will display the message FA-NOT READY.
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F-15
43. How many automatic BITs does JHMCS have and what are they? |
43. Two; the SBIT and the PBIT.
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F-15
44. How many manually initiated BITS are there and what are they? |
44. One; the IBIT.
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F-15
45. Does the PBIT provide an indication if it detects a LRU failure? |
45. Only if all redundant functions have failed.
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F-15
46. How does the IBIT affect system operation? |
46. The IBIT will blank the HMD temporarily.
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F-15
47. What is the maximum number of SRU and functional failure that the JHMCS BIT menu can list? |
47. Three functional failures and 10 SRU failures.
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F-15
48. Describe what information is displayed on the HMD BIT log. |
48. The HMD BIT log displays firmware version, hardware version and hardware serial numbers for each LRU, also elapsed time for the EU, CU and CRT on the HMD. The BIT log itself consists of blocks of error codes. When an error code is selected, it will be displayed along with an English description of the error. Only one English description can be displayed at a time.
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F-15
49. How does the pilot know when a new advisory is displayed on the HMD? |
49. It will flash at a 2.5 Hz rate for one second then become steady.
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F-15
50. What information is displayed on the aircraft and helmet display presentation? |
50. Airspeed, altitude, heading Mach number, and helmet status cues.
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F-15
51. What governs what will be presented on the tactical data display? |
51. The weapons mode selected.
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F-15
52. When can the HMD be blanked and how? |
52. At any time by pressing down on the control stick castle switch and holding forward for more than one second.
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F-15
53. Explain HMD masking and how it is different from declutter. |
53. HMD masking refers to JHMCS ability to selectively remove data and symbology based on helmet LOS. Declutter removes DATA and symbology independent of helmet LOS.
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F-15
54. From where and how is the masking mode and its options selected? |
54. On the MPCD from the JHMCS main menu by using the push button next to the MASK legend to cycle through the masking options.
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F-15
55. What options are available for HMD masking? |
55. H (HUD masking only), C (cockpit masking only) and HC (HUD and cockpit combined masking).
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F-15
56. What LRU determines what HMD LOS look angles fall within the masking zones? |
56. The EU.
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F-15
57. What presentation is displayed on the HMD when HUD masking mode is selected and the HMD LOS is within the HUD masking zone? |
57. All symbology except for the radar LOS circle will be removed from the HMD.
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F-15
58. What presentation is displayed on the HMD when cockpit masking mode is selected and the HMD LOS is within the cockpit masking zone? |
58. All symbology except for the radar LOS circle, SRM FOV and LOS circle, MRM visual launch symbology and PDT LOS symbology will be removed from the helmet display.
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F-15
59. What is the purpose of the JHMCS buffet filter? |
59. To damp unwanted HMD seeker slaving commands sent to the missile and to reduce high seeker head rates caused by pilot head motion as a result of aircraft buffeting.
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F-15
60. At what default AOA does the buffet filter activate (in true AOA)? |
60. 14 degrees true AOA.
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F-15
61. What range of AOA (in cockpit units) can the buffet filter manually be selected to employ? |
61. Between 20 and 40 cockpit units.
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F-15
62. How many cockpit units correspond to 14 degrees true AOA? |
62. 21 cockpit units.
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F-15
63. Describe how HMD data and symbology and audio are recorded along with video of the pilot’s view. |
63. The HMD data and symbology along with the active uplook reticle, weapon release, latitude and longitude at weapon release and mission time is overlaid on top of video of the pilot’s view. This video is inserted into the VTRS before the event marker, so the recorded video will also contain the audio weapon release cue.
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F-15
64. What LRU controls the video source being recorded when JHMCS is operational? |
64. The CC.
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F-15
65. How can the HUD video be switched for recording by VTRS when JHMCS is off or the EU has failed? |
65. By setting the VIDEO CONTROL rotary switch to HUD.
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F-15
66. How can the VTRS be commanded to record HMD at all times independent of the VIDEO CONTROL rotary switch position? |
66. By selecting that option on the JHMCS MPCD main menu.
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F-15
1. What does the VTRS system record? |
1. The 8 mm VTRS records inflight color video of the MICP, HUD and MPCD.
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F-15
2. Where is the HMD/video control panel located? |
2. The HMD/Video control panel is mounted on the right side of the head up display unit.
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F-15
3. Which switch on the HMD/video control panel is used to provide aircraft power to the VTRS? |
3. The OFF/STBY/AUTO/HUD switch.
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F-15
4. The power converter provides what functions? |
4. The power converter converts aircraft 28 VDC to system operating voltages.
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F-15
5. When is an event marker put on the MICP and HUD video signal? |
5. When either the trigger switch is pressed to the second detent or the weapon release switch is pressed.
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F-15
6. What does an event marker symbol look like? |
6. A rectangle.
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F-15
7. Where are the MICP, HUD, and MPCD cameras mounted? |
7. The MICP camera is mounted to the beamsplitter assembly located above the MICP. The HUD camera is mounted in a fixture located on the center glareshield. The MPCD camera is mounted on the lower left windscreen.
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F-15
8. Where are the MICP, HUD, and MPCD video tape recorders located? |
8. The recorders are located in the cockpit in the map case.
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F-15
9. What is the record time of the 8 mm video tape cassette? |
9. The recorders use an 8 mm video tape cassette that provides 120 minutes of recording time.
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F-15
10. Explain the purpose of the EU in the video tape recording system? |
10. The EU receives HDU video from the HDU camera and HUD video from the HUD video control unit. The EU overlays the video from the HDU camera with the symbology that makes up the HMD. With the HMD/video control panel OFF/STBY/AUTO/HUD switch set to AUTO, the EU outputs HUD or HDU video for recording based on commands from the CC.
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F-15
11. Under what condition(s) does the VTR REC light come on? |
11. The REC (record) light is red and comes on when the recorders are in record mode.
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F-15
12. Under what condition(s) does the VTR CAUTION light come on? |
12. The CAUTION light comes on/flashes when any of the following exists: an input power problem exists, cassette tape is near end or has run out, moisture is detected inside video tape recorder, video heads are contaminated, some other malfunction exists or with record mode enabled red tab on tape cassette is out, no cassette is inserted.
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F-15
1. What components make up the RLG INS? |
1. NCI panel, INU, battery, and INU mount.
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F-15
2. What’s the purpose of the NCI keyboard? |
2. To enter data into the INS and CC.
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F-15
3. In what position would you place the data select switch to enter or display magnetic variation? |
3. M/V.
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F-15
4. What’s the function of the WIND position of the data select switch? |
4. To select wind data for entry into and display from the CC.
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F-15
5. What happens when you press the ready switch? |
5. The switch lights and enables the keyboard.
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F-15
6. How can you tell what kind of units of data the DRD is displaying? |
6. The lights above the DRD come on to indicate the units of the displayed data.
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F-15
7. Name subassemblies that make up the INU. |
7. Low-voltage power supply, inertial sensor assembly, strapdown inertial navigation digital computer, signal converter, input-output section, and battery assembly.
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F-15
8. Which INU subassembly contains the RLGs, accelerometers, high-voltage power supply, and calibration memory/temperature multiplexer? |
8. The inertial sensor assembly.
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F-15
9. What’s the purpose of the ISA high-voltage power supply? |
9. To provide voltage for the RLGs.
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F-15
10. Which INU subassembly handles BIT functions and computer mode control? |
10. The strapdown inertial navigation digital computer.
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F-15
11. Which INU subassembly stores INU performance monitor data during flight? |
11. The strapdown inertial navigation digital computer.
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F-15
12. What processors are in the strapdown inertial navigation digital computer? |
12. Navigation processors and an inertial processor.
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F-15
13. What’s the purpose of the INU signal converter? |
13. It does all analog-to-digital and digital-to-analog conversions.
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F-15
14. What INU subassembly handles signal transmission between the INU and the peripheral avionics systems? |
14. I/O section.
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F-15
15. What INS component requires boresighting? |
15. The INU mount.
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F-15
16. What component allows you to select the type of INS alignment? |
16. NCI.
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F-15
17. What are the two different types of INS alignments? |
17. GC and STOR alignments.
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F-15
18. What NCI indication do you get in the first phase of the GC mode? |
18. A steady ALN light.
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F-15
19. How long does a complete GC alignment take? |
19. Approximately four minutes.
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F-15
20. During a GC alignment, what does the left and right DRDs on the NCI indicate? |
20. The NCI left DRD displays alignment time, while the right DRD displays alignment quality.
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F-15
21. What must be done before a complete STOR alignment is accomplished? |
21. A successful GC alignment must have been previously completed and the aircraft must not have been moved after INS was turned off after the stored alignment.
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F-15
22. When can the mode switch be switched to the INS NAV mode? |
22. When the ALN light flashes at a 3-Hz rate.
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F-15
23. What do the RLGs sense? |
23. Angular movement of the aircraft.
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F-15
24. When do the AFCS and AHRS receive analog pitch and roll from the INS? |
24. When an attitude valid signal is supplied by the INU BIT circuitry.
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F-15
25. How does the INU calculate true heading? |
25. The INU corrects the platform heading with the alpha term.
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F-15
26. What does the AI display upon detection of an INS BIT failure? |
26. The AI OFF flag comes into view (only if the INS/AHRE switch is in INS).
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F-15
27. The INS interfaces with what avionics systems? |
27. The CC, radar, HUD, AFCS, AHRS, and BIT systems.
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F-15
28. The H009 MUX bus is the communication link between what two INS related components? |
28. The CC and NCI.
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F-15
29. What MUX bus serves as a communication line between the CC and the INS? |
29. MUX bus 5A and 5B.
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F-15
30. The CC computes what signals to a selected destination? |
30. Steering, distance, and time-to-go.
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F-15
31. Under what condition does attitude information go directly from the INU to the HUD? |
31. Whenever the CC is off or has failed.
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F-15
32. The INS sends what signals to the AFCS? |
32. Pitch, roll, and vertical velocity.
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F-15
33. What LRU besides the BCP is part of the F–15A-D BIT system for INS and what is its purpose? |
33. The avionics status panel; to indicate INU and NCI malfunctions.
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F-15E 1. Which F–15E components perform the function of the F–15A–C NCI? |
1. UFC and the forward sensors control panel.
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F-15E |
2. Alignment status.
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F-15E
3. Will the INU start an INS alignment if the brake hold switch is in the OFF position? |
3. Yes.
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F-15E
4. What three MPD/MPCD display formats are used to display INS information? |
4. EADI, EHSI, and TSD.
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F-15E
5. What INS information is supplied to the LANTIRN NAV and targeting pods on the avionics 1553 MUX bus? |
5. INU operating mode, validity discretes, azimuth, pitch, pitch rate, roll, roll rate, yaw rate, direction of movement, present position, velocities, and acceleration.
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F-15E
6. How is an INS BIT failure indicated on the MPD/MPCD? |
6. An INS* on the MPD/MPCD BIT page.
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F-15E
1. A minimum of how many satellites are required for GPS to provide the most accurate information? |
1. Four.
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F-15E
2. Explain the fifth channel of the EGI GPS. |
2. It constantly roves the sky and will acquire a satellite for several seconds to determine if that satellite would result in better satellite geometry information than any of the four currently used. If the information from the fifth satellite provides better satellite geometry, it is substituted for one of the four currently tracked satellites.
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F-15E
How does EGI use the inertial navigation unit within the EGI LRU to always know its current position? |
The inertial navigation unit in the EGI LRU consists of three ring laser gyros. One gyro measures movement on each axis of the aircraft (X, Y, Z). By entering in exact longitude and latitude coordinates of the F–15E, the EGI LRU knows the exact starting location of the aircraft. Then using the measurements of the laser gyros along each of the three axes, the EGI LRU will always know its current position.
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F-15E
4. What is the FRPA? |
4. The FRPA is an antenna that receives signals from the satellites and routes the RF signals to the EGI preamp.
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F-15E
5. What outputs does the EGI system provide? |
5. The system provides outputs of linear and angular acceleration, velocity, position, attitude (roll, pitch, and platform azimuth), magnetic and true heading, altitude, body angular rates, time tags and GPS time.
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F-15E
6. Explain the purpose of the C sized lithium battery for the EGI system. |
6. When power is off, a C sized lithium battery provides power to maintain a running date/time source, and to store almanac, last position, and crypto key data.`
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F-15E
7. Which component within the EGI LRU receives, tracks, and processes the GPS signal from the FRPA and EGI preamp? |
7. The GEM.
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F-15E
8. Which component within the EGI LRU consists of three ring laser gyros, and three accelerometers? |
8. The EGI LRU ISA.
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F-15E
9. What information does the ADP provide the EGI system? |
9. Barometric altitude.
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F-15E
10. Explain the radar data interface. |
10. The EGI provides pitch, roll, true heading, N/S velocity, E/W velocity, and vertical velocity to the radar data processor (RDP) in the event the INS fails. This data is used to aid in the positioning of the radar antenna.
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F-15E
11. Which component uses inputs from EGI to provide a backup source of attitude for the aircraft in the event of an INS failure? |
11. The ADCP.
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F-15E
12. What are the two primary formats used to display EGI data? |
12. The EADI and EHSI.
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F-15E
13. What LRU is used to enter navigational data used by the EGI system? |
13. Either UFC can be used.
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F-15E
14. When will navigation and steering data displayed on the HUD come from the EGI system? |
14. When EGI is selected as the present position keeping source.
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F-15E
15. Assuming the EGI has been provided with a valid present position, how long will the GC alignment take to complete? |
15. Four minutes.
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F-15E
16. The EGI provides which type of solutions when in navigation mode? |
16. The EGI provides a blended navigation solution, a pure inertial navigation solution, and a GPS only navigation solution.
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F-15E
17. What is anti-spoofing? |
17. Anti-Spoofing (A/S) guards against fake transmissions of a satellite. It is a way for EGI to know the signal it receives is the correct signal from United States satellite, and not a false GPS satellite.
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F-15E
18. In order to use Y-coded signals, what must be accomplished? |
18. To use the Y-coded signals, the current crypto code (keys) must be loaded in the EGI and the keys must be verified by receiving communications from any GPS satellite and matching Y codes with the satellite.
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F-15E
19. When is the IBIT performed? |
19. It is commanded by the ADCP via the MPD/MPCD only when on the ground.
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F-15E
20. Where is the crypto key status displayed? |
20. The MPD/MPCD EGI detail BIT displays EGI LRU failures, EGI SRU failures (maximum of three at a time), functional failures (BATTERY FAIL, ELEC BST REQUIRED), and crypto key status are displayed.
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F-15E
1. List the DMS components. |
1. DMP, MC, TC.
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F-15E
2. Where is the DMP located? |
2. Rear cockpit on the right console.
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F-15E
3. Where does the DMP obtain present position? |
3. The DMP uses present position information from the ADCP.
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F-15E
4. What is stored on the TC? |
4. Digital map, DTED, and static data frames.
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F-15E
5. What type of data is stored on the MC? |
5. Mission specific points, digital map, DTED, and data frame information.
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F-15E
6. What are the power requirements for the DMS? |
6. 3 phase, 115 VAC.
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F-15E
7. Where are the DMP circuit breakers located on the aircraft? |
7. Rt. CB panel #3.
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F-15E
8. When will the DMS come out of stand-by mode? |
8. The DMS remains in standby until a TSD or data frame is selected on any MPD/MPCD.
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F-15E
9. Name the two operating modes of the DMS? |
9. TSD or data frame.
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F-15E
10. Describe the TSD format? |
10. Navigational data is superimposed over the map display.
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F-15E
11. What permits improved viewing of the TSD display at night. |
11. Inverse video.
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F-15E
12. What are the available map scales? |
12. 10, 20, 40, 80, and 160 nmi.
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F-15E
13. What does declutter do for the pilot? |
13. Removes a selected group of information from the TSD. If the DCL is pressed again, another level of information is removed. When pressed again, the TSD is returned to its initial state.
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F-15E
14. Describe the symbol and purpose of a steer point. |
14. Indicate where steering maneuvers will take place.
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F-15E
15. Describe the static ring threat. |
15. Displayed as circles centered around a point where the aircraft is potentially vulnerable to a defined threat.
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F-15E
16. What is sensor cueing? |
16. Commanding the radar or targeting pod to look at specific points on a TSD.
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F-15E
17. What is data frame mode? |
17. Digital files stored within the DMS theater and mission cartridge that contains a variety of imagery information.
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F-15E
18. When is a test considered failed? |
18. After five consecutive attempts.
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F-15E
19. Which BIT suspends normal DMP operations? |
19. Initiated BIT.
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F-15E 20. Which DMS BIT will display a failed SRU?
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20. Detail BIT.
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