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51 Cards in this Set
- Front
- Back
Max EGT limits for Start
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800F for 1 min, then up to 1200F
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Max EGT limits for GEN ONLY
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decreases from 1200F to 800F
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Max EGT limits for EWO
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1300F
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APU RPM for normal, GEN ONLY, and EWO modes is approx __________.
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100 – 103%
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When checking the FIRE system on the APU you should see the ________ light come on then the ________ light to know that the system check’s good.
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DSBLD, FIRE
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The APU DRS OPN light will go out _______ after you select STOP and you should check that it goes out within _______.
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30 sec; 1 min
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You cannot restart an APU for ____ or ________ indications but you are allowed ___ restart for transient BITE codes.
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Fire or overheat; 1
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T/F Once an ESCU has initiated a shutdown or start, it cannot be manually interrupted by normal controls until the sequence is complete.
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TRUE
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To ensure the APU doors are not frozen shut when OAT is below 4C and visible moisture is present, ___________________________ prior to starting the APUs.
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Open and close the APU doors manually
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Automatic stopping of the APU may indicate a _______ or ________.
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Fire or overheat within the unit
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APU Start Accumulator Pressure is _____________.
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3,000 +/- 350 PSI
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EWO mode should only be used _______.
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When authorized by the proper authority
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To place both APUs in EWO mode press the ______ switch.
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EWO
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If the emergency dictates, the APU’s may be shut down by pressing the ____.
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APU DISENG switch
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Do not operate the air conditioning system with the right alternate pressurization switch in _____ for an extended period of time.
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Full increase
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The Ready light will come on if the APU is operating in either the ________ or ________ mode.
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Normal or EWO
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You have just arrived at the aircraft and you see the DRS OPEN and RDY light illuminated. This indicates the APUs _______.
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Have reached 100% in the Normal mode
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Your #1 APU is running, and the FIRE light has just illuminated. What does it mean?
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The fire detection system has been activated
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You have just arrived at the aircraft, the DRS OPEN, RDY, EWO #1 and EWO #2 lights are illuminated. What do they indicate?
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It indicates that the APUs are operating in the EWO mode
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The APU HYD accumulators are pressurized by:
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Right HYD system or the Left after Crossover
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What will the APUs do if you press the EWO start switch?
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Any non-operating APU will be started in EWO mode and any APU already operating in Normal or Generator-only mode will be upgraded to EWO mode
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Use the 18 inch handle for_____.
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Manually operating the APU doors
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Check the APU enclosure floor for evidence of fuel or HYD fluid prior to a _____ start.
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Non-EWO
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When checking APU oil quantity, make sure the ________ is retained in position during removal and installation of the dipstick.
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Dipstick O-Ring
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With the APU Generator Switch in the GEN TEST, check the ACTIVE GENERATOR lights to determine_________.
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Which APU has the generator installed
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When the Fire/DSBLD switch is pressed at the APU aft control panel, the FIRE light illuminates if the ______ checks good.
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Fire detection system
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If APU surge bleed pulsing occurs after the RDY light comes on___.
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Shut down the APUs
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Bleed air from the APUs cannot reach the air conditioning pack if the ____ is not open.
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Crossover valve
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Be sure the ram air inlet scoop and outlet ducts are open and clear before ________ the airplane with the APUs.
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Heating
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To enter either normal or generator only mode from EWO mode, ____.
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Shut down and restart the APU
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If the APU doors are manually operated in one direction, they must be _____ to reset the door linkage.
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Manually operated in the opposite direction
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(APU) A fire or overheat condition within the unit may be indicated by an _____.
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Automatic stopping of the APU
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Accomplish an emergency APU shutdown by _______.
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Pressing EMER STOP switch
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The APU is running with DRS OPEN and RDY light on. You see the DSBLD light and then FIRE light come on. What has happened?
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Someone has pressed the FIRE/DSBLD switch
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Check APU battery voltage at approximately 24 volts. If the APU battery voltage is ______, press the APU battery disengage switch to operate the APU using the airplane battery.
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LOW
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Additional start accumulator pressure may be required ______.
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If temperature is below normal
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Which of the following are advantages to operating an APU in GEN ONLY mode?
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Decreased fuel consumption, Decreased noise, Increased APU engine life
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It takes ______ seconds for the DRS OPN light to go out when the START-STOP switch is positioned to STOP.
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30
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EGT will indicate approximately _________ degrees in normal mode.
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1200 (800 for 1 min after start, then 1200F
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From the cockpit, an APU fire is indicated by
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Illumination of the APU FIRE light
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When momentarily set to GEN ONLY, the ________________ actuates the low EGT limit control circuit which prevents bleeding air for engine start or air conditioning and turns out the RDY light.
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Mode selector switch
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The DRS OPN portion of the DRS OPN/RDY lights come on when the appropriate APU inlet and exhaust doors ____________________.
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Are fully open
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The BITE INDICATORS automatically reset ______________________unless a malfunction exists.
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On the next start sequence
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A transient fault may be reset only by_________________________.
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Attempting another start
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The ______________________, when set to ON, commands the APU generator control unit (GCU) to turn on the generator.
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APU Generator Switch
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Normal system pressure on the Start Accumulator Pressure Gauge is approximately ________ PSI.
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3000 (+/- 350)
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Manual charging of the APU Start Accumulators requires approximately _____ full pump strokes to complete recharging.
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500
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The APU fire detector system remains energized for ____ minutes after the APU’s are shut down.
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5
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If takeoff is attempted with APU operating, inlet and exhaust doors will be open for approximately 1 minute after________.
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liftoff
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Prior to applying external power to the airplane, ensure ____________________ are off to prevent inadvertent actuation of gear doors, powered rudder, or spoilers.
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Hydraulic auxiliary pumps
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APU Shutdown (Normal)- Once a start-stop switch has been set to STOP, the APU cannot be restarted until the _____________________.
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DRS OPN light goes out
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