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Auxiliary Power Unit Fire Emergency Procedure

NOTE

If an auxiliary power unit (APU) fire warning occurs while the APU is not in operation, follow the Wing/Empennage and Bleed Air Isolation Procedure.

1. APU Fire Emergency Control Handle - Pull

WARNING

Do not discharge No. 2 bottle unless fire or overheat persists after discharging the NO. 1 bottle and isolation actions have been carried out.

CAUTION

Discharge the agent only after pulling the emergency control fire handle. Do not hold the AGENT DISCHARGE switch at NO. 1 or NO. 2 for more than 2 seconds, otherwise the FIRE EXT circuit-breaker may trip.

2. No. 1 AGENT DISCHARGE Switch - Actuate (if condition persists)

3.If condition persists, isolate the APU:

a.No. 1 & No. 2 Engine BLEED AIR Switches - OFF

b.BLEED AIR DIVIDER Valve Switch - OFF

4. No. 2 AGENT DISCHARGE Switch - Actuate (On pilot command, if condition persists)

5. Clean-up:

a. APU Generator Switch - OFF/RESET

b. APU CONTROL Switch - STOP

c. APU BLEED AIR VALVE Switch - CLOSE

6. " Clean-up Completed"

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