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MAINTENANCE MANUAL
BTL A BTL B
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APU Fire Extinguishing System Component Location
Figure 1 (Sheet 1)
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MAINTENANCE MANUAL
APU Fire Extinguishing System - Component Location
Figure 1 (Sheet 2)
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ASSEMBLY
E
APU Fire Extinguishing System Component Location Figure 1 (Sheet 3)
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5. Operation (Fig. 2)
_________
A. Functional Description
(1)
When a fire is detected in the APU compartment, the APU fire switch handle red warning light illuminate and the fire warning bell sounds through the aural warning speakers. When the airplane is on the ground and a fire is detected, the APU warning horn and red APU FIRE light on M869 APU shutdown module also operate.
(2)
When the APU fire switch handle is pulled out, the APU automatically shuts down and the extinguishing bottle is armed. The following also happens: the APU generator field relay and generator circuit breaker are tripped; the APU fuel shut-off valve closes; the APU air supply valve closes; and the fire bell and warning lights are all shut off. If the airplane is on the ground, the external fire warning horn and APU fire light on M869 APU shutdown module are also shutoff.
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