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Engine Fire Protection

Also from: APU Fire Protection

Consists of (for each engine):

• 2 identical detection loops in parallel (A and B) (APU also has 2 loops)
• fire detection unit (FDU)
• 2 fire bottles (1 for APU)
• lights and switches

Pushing an engine FIRE pb sw:

• silences the aural warning
• arms the squibs
• closes LP fuel, hydraulic, bleed, and pack valves
• cuts off the FADEC power supply
• starts a countdown to allow the engine to slow down before releasing agent

Pushing the APU FIRE pb sw:

• shuts down the APU
• silences the aural warning
• arms the squib
• closes fuel and bleed valves (and closes the crossbleed valve)
• shuts off APU fuel pumps
• deactivates the APU generator

Fire test

APU

Check the FIRE pb sw is in and guarded, and the AGENT light is extinguished. Pressing the TEST button gives:

• APU FIRE pb sw illuminates red and the SQUIB and DISCH lights come on
• MASTER WARN light illuminates and a continuous repetitive chime sounds
• APU FIRE warning appears on the ECAM
• APU ECAM page is displayed

Also check that the APU fire extinguisher overpressure indication (red disc) is in place.

Engines

Pressing the TEST button gives:

• ENG 1(2) FIRE pb sw illuminates red and the SQUIB and DISCH lights come on
• MASTER WARN light illuminates and a continuous repetitive chime sounds
• ENG 1(2) FIRE warning appears on the ECAM
• FIRE lights on the engine ENG panel illuminate
• ENGINE ECAM page is displayed

Fire detection loops

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).

Fire bottles

The bottles each have 1 squib with dual electrical supply, including the HOT bus. The extinguishing agent is Halon.

Failures

Categories: Airbus A330 | Fire Protection | APU | Power Plant