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21 Cards in this Set

  • Front
  • Back

What type of fire extinguishing agent is best for both cabin fires and engine fires?

Halon 1301.
What is a major disadvantage of "CB" fire extinguishing agent for extinguishing aircraft fires?
It is corrosive to aluminum and magnesium.
Why is carbon tetrachloride not recommended as a fire extinguishing agent?
Carbon tetrachloride produces phosgene, a deadly gas, when it is exposed to flames.
What is used as a fire extinguishing agent in most of the high–rate discharge systems installed in aircraft?
One of the halogenated hydrocarbons, such as Halon 1301, pressurized with nitrogen.
How can you determine the state of charge of a CO₂ fire extinguisher?
By its weight.
How can you determine the state of charge of a freon fire extinguisher container?
By the pressure shown on the built–in gage.
How does the ambient temperature effect the pressure shown on the pressure gage on a freon fire extinguisher?
The higher the temperature, the high the pressure.
What releases the fire extinguishing agent in a high–rate discharge bottle?
An electrically ignited powder charge blows a knife through a seal in the HRD bottle.
What precaution must you observe when checking the electrical squib of an HRD fire extinguisher bottle for electrical continuity?
It takes only a small amount of current to ignite the powder charge, and the method of testing must not send this amount of current through it.
Does a thermocouple fire detection system warn the pilot of a general overheat condition?
No, it operates on the rate of temperature rise, and it detects only a fire.
Does a thermal switch fire detection warn the pilot of a general overheat condition?
No, it actuates only when there is a fire.
How is a thermoswitch fire detector circuit checked?
Close the test switch. If the system is continuous and not shorted, the fire–warning light and bell will actuate.
How is a continuous–loop fire detector circuit checked?
Close the test switch. If the system is continuous and not shorted, the fire–warning light and bell will actuate.
Does a pneumatic fire detection system warn the pilot of a general overheat condition?
Yes, it actuates when there is a fire or a general overheat condition.
How is the pneumatic fire detection system tested?
When the test switch is closed, low–voltage AC flows through the stainless steel tube in which the gas absorbing element is housed. This current heats the element which releases gas and actuates the fire warning light and bell.
What happens when the Fire–Pull T–handle is pulled in a jet transport aircraft?
The bottle discharge switch is uncovered and armed, the generator field relay is tripped, fuel is shut off to the engine, and hydraulic fluid is shut off to the pump. The engine bleed air is shut off and the hydraulic pump low–pressure lights are deactivated.
What must be done to release the fire extinguishing agent after the Fire–Pull T–handle has been pulled?
The Bottle Discharge switch must be closed.
What type of fire extinguisher is recommended for extinguishing a brake fire?
A dry–powder type extinguisher.
How can you determine whether or not a built–in fire extinguishing system has been discharged?
By checking the blowout plugs on the outside of the aircraft near the extinguisher agent bottles.
What is indicated if the red disk in a built–in fire extinguishing system is blown out?
The agent bottle has been discharged because of an overheat condition.
What is indicated if the yellow disk in a built–in fire extinguishing system is blown out?

The agent bottle has been discharged by the flight crew actuating the Bottle Discharge switch.