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 A.  The APU fire detection system monitors temperature in the compartment and responds to overheat or fire by activating warning lights, alarm bell, and horn, and shutting down the APU.
 B.  The APU fire detection system uses power from the 28-volt dc battery bus. The system circuit breaker is on circuit breaker panel P6-2.
 C.  The signals from the single detector loop are configured in OR-logic.
 D.  APU fire indications are lights on the engine and APU fire control panel, master warning lights on the lightshield, and an alarm bell.
 E.  When the airplane is on the ground, additional APU fire indications are a warning light on the APU ground control panel and a horn in the main wheel well.
Engine and APU Fire Control Panel
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 A.  The engine and APU fire control panel P8-1 is on the pilots' control stand. Components of P8-1 applicable to APU fire detection are APU DET INOP light, fire switch handle warning light, TEST switch, and BELL CUTOUT switch.
 (1)  
The DET INOP light provides an indication of short circuit. The DET INOP-light circuitry is also connected to the master caution lights.

 (2)  
A fire warning light in the APU fire switch handle provides APU area fire warning. The APU fire warning light is connected to the APU fire detection card. A fire or overheat condition in the APU area will cause steady illumination of the warning light. The fire warning light consists of several bulbs covered by a red translucent plastic lens cap in the fire switch handle.

 (3)  
The TEST switch has three positions: FAULT/INOP-off-FIRE/OVHT; The switch is spring-loaded to the off position. The switch permits testing of the APU fire detection system by checking sensor continuity and simulating a fire condition when positioned to FIRE/OVHT. During fire/overheat test the APU automatic shutdown circuitry is inhibited. When in the FAULT/INOP position, the fault discrimination circuit of the APU fire detection card is tested and the inoperative light will illuminate.

 (4)  
A switch is provided for alarm bell control. Pressing the switch provides 28 volts dc to the signal condition control card in the fire detection accessory unit. The control circuit silences the bell and extinguishes the master fire warning lights on P7.

APU Fire Detector Elements
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 A.  Detector elements are in the engine and exhaust areas of the APU. Detector elements are in the engine compartment, exhaust heat shield, and muffler assembly.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

DETECTOR 
APU EXHAUST 
AREA 
SEE  A 
APU 
SEE  B 
HEAT SHIELD AND 
MUFFLER ASSEMBLY 
SEE  C 
DETECTOR 
APU HEAT SHIELD AND 
MUFFLER ASSEMBLY DETECTORS 
A
SEE  C 

FWD
DETECTOR
APU FIRE DETECTOR LOCATION
B

APU Fire Detection System - Component Location
Figure 1 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
ELECTRICAL CONNECTORS
DETECTOR
DETECTOR WITH CONNECTORS C
ELECTRICAL TERMINALS
DETECTOR
DETECTOR WITH TERMINAL LUGS C
APU Fire Detection System - Component Location
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
H50531
A

737-300/400/500
MAINTENANCE MANUAL

FIRST OFFICER'S
CAPTAIN'S LIGHT
　
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