Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
17 Cards in this Set
- Front
- Back
|
What type of fire detector system are used for engine fire detection? |
Overheat, rate-of-rise , and flame detector :) |
|
|
How does a thermal switch fire protection system operate?
|
When heated past a predetermine temperature, the switch closes causing the warning device in the cockpit to activate...
|
|
|
How many thermal switches are needed in a thermal switch fire protection system?
|
At least One...
|
|
|
What kind of fire detection system allows more complete coverage than a spot-type system?
|
Continuous loop System....
|
|
|
What happens if an engine equipped with a thermocouple fire warning system overheats slowly?
|
Nothing , because a fast temperature rise or rapid heating is required for this type of fire system to operate.
|
|
|
What electrical power is required for a thermocouple fire protection system to operate?
|
Both the thermocouple-produced power and the aircraft electrical system are required for this type of fire protection system to operate...
|
|
|
What is the likely cause if a false fire warning ?
|
The engine fire sensing loop is bent or kicked excessively...
|
|
|
What are fire extinguishing system designed to do?
|
They are designed to dilute the oxygen levels around the engine to a point that doesn't allow combustion, or to reduce temperature below the ignition point. |
|
|
Describe how a Kidde and Fenwal continuous loop fire protection system function...
|
A Kiddle system has a sensing element consisting of a sealed Inconel tube containing two conductors that are embedded in a thermistor material. One wire is electrically grounded to the outer tube at each end and acts as an internal ground, and the other is a positive lead. When a fire or overheat occurs , the thermistor material drops, allowing current to flow between the two wires to activate an alarm. element A Fenwal system uses a sensing element consisting of a small diameter flexable tube containing a single wire electrode surrounded by ceramic beads prevent the electrode and tube from touching each other. Current is applied to the electrode while the outer tube is grounded to the aircraft structure. When a fire or overheat occurs , the core resistance of the ceramic beads drops , allowing current to flow between the center electrode and ground, energizing the alarm system...... |
|
|
What element must be present for a fire to occur?
|
An ignition source such as heat or a spark m fuel and oxygen...
|
|
|
What group if fire extinguishing agents are no longer manufactured because of environmental concerns?
|
Halons(0r freon or chlorofluorocarbons)
|
|
|
How are fire extinguishing agents distributed?
|
Through perforated tubing and/or discharge nozzles...
|
|
|
What is the purpose of the discharge cartridge and how is it activated?
|
The discharge cartridge , or squib , which is electrically ignited. fires a projectile into the frangible disk, thereby releasing fire extinguishing agent.
|
|
|
How is a fire extinguisher system with a high rate of discharge classified ?
|
As an HRD fire extinguisher System....
|
|
|
What do the red and yellow discs in a fire extinguishing system indicate?
|
Yellow it was a normal discharge and red a thermal discharge....
|
|
|
How is the fire extinguishing agent in an HRD system distributed, and how long does it take to discharge?
|
The agent is distributed through serious of high pressure tubes and take 1 to 2 second to discharge....
|
|
|
What is the purpose of a pressure gauge in a fire extinguishing system?
|
Indicated pressure with the container. To check if the pressure is within limits, a pressure-temperature chart is used...
|
