26-23-00
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A
737-300/400/500MAINTENANCE MANUAL
(b) If any lights do not come on, then replace the faulty light. To replace it, do this task: Light Pushbutton Switch - Lamp Replacement (AMM 33-11-82/201).
S 812-005
(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.
(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.
D. Fault Isolation Procedure - EXT FWD or AFT Lights Both Off
S 812-006
(1) Replace the CARGO FIRE panel. These are the tasks
(AMM 26-00-02/401):
-
Cargo Fire Control Panel Removal
-
Cargo Fire Control Panel Installation
(a) If the replacement test passed, then you corrected the fault.
E. Fault Isolation Procedure - One EXT FWD or AFT Light Does Not Come On
S 812-007
(1) Replace the squib indicated by the light that did not come on. These are the tasks (AMM 26-21-31/201):
-
Engine Fire Extinguisher Bottle Squib Removal
-
Engine Fire Extinguisher Bottle Squib Installation
(a)
If the replacement test passed, then you corrected the fault.
(b)
If the replacement test failed, then continue.
S 812-008
(2) Do a check of the wiring from the applicable squib to the CARGO FIRE panel.
(a)
If you find a problem with the wiring, then do these steps: 1) Repair the wiring. 2) Push the TEST switch on the CARGO FIRE panel. 3) Make sure the EXT FWD and AFT lights on the CARGO FIRE
panel come on.
a) If the lights come on, then you corrected the fault.
(b)
If you do not find a problem with the wiring, then continue.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 812-009
(3) Replace the CARGO FIRE panel. These are the tasks
(AMM 26-00-02/401):
-
Cargo Fire Control Panel Removal
-
Cargo Fire Control Panel Installation
(a) Make sure the EXT FWD and AFT lights on the CARGO FIRE panel come on when the TEST switch is pushed. 1) If the lights come on, then you corrected the fault.
TASK 26-23-00-812-021
3. Discharge Light - Fault Isolation_________________________________
A. General
(1)
This task is for the DISCH light on the CARGO FIRE panel.
(2)
The DISCH light comes on when low pressure is detected in a fire bottle.
(3)
These are the possible causes
(a)
Fire bottle
1) Bottle 1 M2248
2) AIRPLANES WITH ETOPS;
Bottle 1 M2263
(b)
CARGO FIRE panel P8-75
(c)
Wiring
(4)
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
B. References
(1)
SSM 26-23-11
(2)
WDM 26-23-11
C. Initial Evaluation
S 862-023
(1)
On the CARGO FIRE panel, make sure the DISCH light is off.
(2)
If light is on, then do the Fault Isolation Procedure below.
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