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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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