Engines: Fire Protection & Detection Flashcards
Describe a typical aircraft fire detection and protection system.
A typical engine fire detection and protection system would consist of the following:
1. Overheat and fire detection loop(s) with multisensors. Note that normally a minimum of two
separate systems (loops) exist per unit. These are coupled with visual (lights) and aural
indications for both overheat and fire detected conditions for
a. Each engine
b. Auxiliary power units (APUs)
c. Wheel wells (not on all aircraft types)
2. Fault monitoring system of overheat and fire detection systems. This is coupled with visual
indications for
a. Engines
b. APUs
3. Fire extinguishers and firing circuits for
a. All engines. Note that usually there are a minimum of two extinguisher bottles that can fire into each engine so as to provide a second extinguishing supply to all engines. This is coupled with visual indications of bottle discharge.
b. APUs. Note that usually there is a separate single fire extinguisher bottle. This is coupled with
visual indications of bottle discharge.
4. Testing facility of
a. Firing circuits for
(1) Engine fire extinguisher(s)
(2) APU fire extinguisher
b. Fault monitoring system
c. Overheat/fire detection loops for
(1) Each engine
(2) APUs
5. Lavatory/cargo holds smoke detection system
What are the indications of thermal expansion and use of the fire bottles on the side of the
aircraft fuselage?
Separate disks, i.e., one for extinguishent release due to thermal expansion and one to indicate use,
normally are found on the side of the aircraft’s fuselage. If they are intact, they indicate that the
extinguishent is still in the fire bottle.
Note: The color and location of such disks are aircraft type-specific.
Describe a typical engine fire drill.
SOP and GO!
