26-15-00
 ALL  ú ú 01 Page 107 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G18381
A
737-300/400/500MAINTENANCE MANUAL
 APU FIRE DETECTION SYSTEM - ADJUSTMENT/TEST
___________________________________________
 1.  General_______
 A.  The APU fire detection system monitors the temperature in the APU compartment. When an overheat or fire condition exists, the system activates: the fire warning lights, the alarm bell, and the warning horn. The system also does a shutdown of the APU.
 B.  The APU fire detection system uses power from the 28-volt dc battery bus. The circuit breaker is on the P6-2 panel.
 C.  There are two tasks in this section:
 (1)  
Operational Test of the APU Fire Detection System

 (a)  The operational test is done in a minimum of time, and uses equipment installed on the airplane to make sure that the system will operate correctly.

 (2)  
System Test of the APU Fire Detection System.

 (a)  The system test is a full check of the APU fire-detection system.
 TASK 26-15-00-715-001
 2.  APU Fire Detection Operational Test___________________________________
 A.  References
 (1)  AMM 24-22-00/201, Electrical Power - Control
 B.  Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 205 Electronic Compartment
 217 Right Main Wheel Well

 C.  Prepare to do the Operational Test
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Make sure these circuit breakers are closed:

 (a)  P6 Load Control Center - Right 1) FIRE PROTECTION DETECTION, ENG NO. 1
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-15-00
 ALL  ú ú 01 Page 501 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 2) FIRE PROTECTION DETECTION, ENG NO. 2 3) FIRE PROTECTION DETECTION, APU 4) MASTER WARNING AND CONTROL 5) LANDING GEAR, LIGHTS
 S 865-094
 (3)  Open these circuit breakers on the P6-2 panel:
 (a)  OVHT WHL WELL WNG BDY
 D. Procedure
 S 865-120
 (1)  Try to pull the APU fire switch handle on the Engine and APU Fire Control panel (P8-1).
 (a)  The switch must stay in the locked position.
 S 865-123
 CAUTION: DO NOT TURN THE FIRE SWITCH WHILE IT IS IN THE OUT POSITION.
_______
 THE CONTENTS OF THE BOTTLE WILL BE LET OUT.

 (2)  
Push the override button below the APU fire switch.

 S 865-122

 (3)  
Pull up on the APU fire switch.

 (a)  The lock should be released and the switch pulled out.
 S 865-124
 (4)  
Push the APU fire switch to close.

 S 865-114

 (5)  
Hold the TEST switch, on the P8-1 panel, to the OVHT/FIRE position.

 (a)  Make sure that these indications occur: 1) The two (red) FIRE WARN lights on the P7 panel come on. 2) The lights in the APU fire switch come on. 3) The alarm bell in the control cabin operates. 4) The warning horn in the wheel well operates. 5) The fire warning light in the main wheel well flashes.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-15-00
 ALL  ú ú 02 Page 502 ú Jul 12/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-125
 CAUTION: DO NOT TURN THE FIRE SWITCH WHILE IT IS IN THE OUT POSITION.
_______
 THE CONTENTS OF THE BOTTLE WILL BE LET OUT.

 (6)  Pull the APU fire switch out.
 NOTE: The switch must be released without use of the override
____
 switch.

 S 865-126
 (7)  
Push the APU fire switch in to close.

 S 865-127

 (8)  
Move the LIGHTS switch on the P2-1 panel to the DIM position.
　
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