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Also from: APU Fire Protection
Consists of (for each engine):
Pushing an engine FIRE pb sw:
Pushing the APU FIRE pb sw:
APU
Check the FIRE pb sw is in and guarded, and the AGENT light is extinguished. Pressing the TEST button gives:
Also check that the APU fire extinguisher overpressure indication (red disc) is in place.
Engines
Pressing the TEST button gives:
The fire detection loops are gas filled tubes whose pressure changes with temperature. If the pressure increases, a fire indication is generated, whereas a drop in pressure indicates a fault. The fire detection loops feed into an FDU (there is 1 FDU per engine, including the APU).
The bottles each have 1 squib with dual electrical supply, including the HOT bus. The extinguishing agent is Halon.
ENG 1(2) FIRE LOOP A(B) FAULT | - fire detection remains fully operational after a single loop fails |
ENG 1(2) FIRE DET FAULT | - both loops or the FDU [Fire Detection Unit] have failed - if both loops break within 5s, a fire warning is triggered and does not extinguish |
Categories: Airbus A330 | Fire Protection | APU | Power Plant
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