(2)  
Close the CARGO FIRE EXTINGUISHING circuit breaker on the P6 or P18 panel.

 (3)  
If the FWD ARM light comes on, push the FWD ARM switch and the DISCH switch.

 (4)  
If the AFT ARM light comes on, push the AFT ARM switch and the DISCH switch.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH LOWER CARGO FIRE ú

 26-23-00
 EXTINGUISHING SYSTEM  ú ú 02 Page 6 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CARGO BAY EXTINGUISHING - FAULT ISOLATION
_________________________________________
 1.  General_______
 A.  This section contains the Fault Isolation procedures for the cargo bay fire extinguishing system. These include tasks for the squib test light, the discharge light, and for when the bottle does not discharge after the DISCH switch was pushed.
 2.  Squib Test Light Fault Isolation________________________________
 A.  Description
 (1)  
This task is for the EXT FWD and AFT lights on the CARGO FIRE panel.

 (2)  
The EXT FWD and AFT lights come on when the TEST switch pushed, to show there is continuity through the squibs. If the lights do not come on, then there is a problem with the discharge system.

 B.  Possible Causes
 (1)  
Squib

 (a)  
M2249 (bottle 1 forward)

 (b)  
M2250 (bottle 1 aft)

 (c)  
AIRPLANES WITH ETOPS;
 M2264 (bottle 2 forward)

 (d)  
AIRPLANES WITH ETOPS;
 M2265 (bottle 2 aft)

 (2)  
CARGO FIRE panel P8-75

 (3)  
Wiring

 C.  Circuit Breakers
 (1)  This is the primary circuit breaker related to the fault:
 (a)  Circuit Breaker Panel, P18-2:
 1) CARGO FIRE EXT 1

 2)  AIRPLANES WITH ETOPS;
 CARGO FIRE EXT 2

 D.  Related Data
 (1)  
SSM 26-23-11

 (2)  
WDM 26-21-11

 E.  Initial Evaluation
 (1)  
Set the DIM/BRT/TEST switch on the captain's instrument panel, P1 to TEST.

 (a)  
Make sure the EXT FWD and AFT, the ARM FWD and AFT, the DETECTOR FAULT and the DISCH lights on the CARGO FIRE panel come on.

 (b)  
If any lights do not come on, then replace the faulty light. To replace it, do this task: Lighten Pushbutton Switch - Lamp Replacement (AMM 33-18-00/201).

 (2)  
Push the TEST switch on the CARGO FIRE panel.

 (a)  If the EXT FWD and AFT lights come on, then the problem is intermittent.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 101 ú Nov 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  
If the EXT FWD and AFT lights both stay off, then do the Fault Isolation Procedure - EXT FWD and AFT Lights Both Off.

 (c)  
If one of the EXT FWD and AFT lights come on, then do the Fault Isolation Procedure - One EXT FWD or AFT Light Does Not Come On.

 F. Fault Isolation Procedure - EXT FWD or AFT Lights Both Off
 (1)  Replace the CARGO FIRE panel. These are the tasks:
 Cargo Fire Control Panel Removal
 (AMM 26-00-02/401)
 Cargo Fire Control Panel Installation
 (AMM 26-00-02/401)

 (a)  If the replacement test passed, then you corrected the fault.
 G. Fault Isolation Procedure - One EXT FWD or AFT Light Does Not Come On
 (1)  
Replace the squib indicated by the light that did not come on. These are the tasks: Engine Fire Extinguisher Bottle Squib Removal (AMM 26-21-02/401) Engine Fire Extinguisher Bottle Squib Installation (AMM 26-21-02/401)

 (a)  
If the replacement test passed, then you corrected the fault.
　
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