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Engine Fire Systems
O&P(P)
| Question | Answer |
|---|---|
| What are the engine fire zones | The engine power section; The engine accessory section; Except for recip engines, any complete powerplant compartment in which no isolation is provided between the power section and the accessory section; any APU compartment; any fuel-burning heater and o |
| What different types of fires can occur in an engine compartment | Recip engines, fires can occur from fuel leaks spraying hot engine compartments, exhaust leaks streaming hot gases on other components or the engine cowling and electrical faults. Turbine engine failures can cause turbine blades to melt and seperate from |
| What are four types of engine fire detection systems? | Thermocouple, Thermoswitch, Thermistor-type continuous loop, Pneumatic type continuous loop |
| Which type of fire detection operates on a rate of temp rise? | Thermocouple |
| Why must the reference junction in a thermocouple fire detection system be thermally insulated? | The reference junction must be insulated so its temp will not rise as quickly as that of the measuring junctions if a fire should occur |
| How do you check a thermocouple fire detection system operation? | Press the test switch. This heats the thermocouple enough for it to close the sensitive relay, which in turn closes the slave relay and activates the fire warning light and bell |
| How is a pneumatic type continuous loop fire detection system checked for operation? | When the test switch is closed, low voltage AC flows through the tube that encloses the sensitive element. This current heats the element enough for it to release sufficient gas to activate the alarm switch |
| What would likely cause a false fire alarm in a thermistor-type continuous loop system | A kinked or pinched continuous loop element |
| If there is a break in a single wire continuous loop fire detector element, and the system test bad, will it indicate the presence of a fire | Yes, Even though it test bad, it will still indicate the presence of a fire |
| What maintenance is allowed on a continuous loop fire detection system | Inspect and replace as needed the continuous loop element, the controller, and the fire warning bell and/or light |
| What is used as a fire extinguishing agent in some older aircraft | Carbon Dioxide |
| What fire extinguishing agent is used in the high rate discharge bottles installed in a jet transport aircraft | Halogen 1211 or 1301 |
| How is a high rate discharge bottle of fire extinguishing agent discharged | A powder charge is ignited and it blows a cutter through a frangible disc that seals the bottle |
| Wat precaution must be taken when checking the electrical circuit for igniting the powder charge in the valve of a high rate discharge bootle | The current used to check the integrity of the electric circuit must not be high enough to ignite the powder charge |
| What color and marking identifies the fluid lines that carry the fire extinguishing agent in an aircraft | Brown tape with a series of diamonds in it |
| What happens in a jet transport airplane when the fire-pull T-handle fir an engine is pulled | The engine fuel shutoff valve closed, and the generator field relay is tripped; The compressor bleed air valve is closed; The anti-ice valve is closed; The hydraulic supply shutoff valve is closed; The hydraulic pump low-pressure warning lights are turned |
| What is indicated if the red discharge indicator for a fire extinguisher system is blown out | The system has been discharged by an overheat condition |
| What is indicated if the yellow discharge indicator for a fire extinguishing system is blown out | The system has been discharged by actuating the bottle discharge switch |
Created by:
tbarth
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