S 862-025

 (3)
If the light is off, then there was an intermittent fault.

 S 862-024
 D.  Fault Isolation Procedure
 S 812-010
 (1)  Do this check of the fire bottle:
 (a)  Remove the connector from the applicable pressure switch on the fire bottle.
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 (b)  If the light goes off, then replace the fire bottle. 1) These are the tasks (AMM 26-23-01/401):
 -
Cargo Fire Extinguisher Bottle Removal

 -
Cargo Fire Extinguisher Bottle Installation

 a)  If the DISCH light goes off, then you corrected the fault.
 (c)  If the light stays on, then continue.
 S 812-011
 (2)  Do this check of the wiring:
 (a)  
Remove the connector from the CARGO FIRE panel.

 (b)  
If the light goes off, then do these steps: 1) Repair the wiring. 2) Re-connect the connector to the pressure switch. 3) Re-connect the connector to the CARGO FIRE panel. 4) If the BOTTLE DISCHARGED light goes out, then you corrected

 the fault.

 (c)  
If the light stays on, then continue.

 S 812-012
 (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)  If the DISCH light goes off, then you corrected the fault.
 TASK 26-23-00-812-022
 4.  Cargo Fire Bottle Did Not Discharge When The DISCH Switch Was Pushed -______________________________________________________________________ Fault Isolation_______________
 A.  General
 (1)  
This task is for the fire extinguishing system when the DISCH switch on the CARGO FIRE panel is pushed, but there is no indication that the fire bottle discharged.

 (2)  
These are the situations that could cause this indication:

 (a)  
The squib did not fire.

 (b)  
The squib did fire but the bottle did not discharge.

 (c)  
The bottle did discharge but there is no indication on the flight deck.

 (3)  
These are the possible causes.

 (a)  
Wiring

 (b)  
Squib
 1) M2249 (bottle 1 forward)
 2) M2250 (bottle 1 aft)

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 3) AIRPLANES WITH ETOPS;
 M2264 (bottle 2 forward)
 4) AIRPLANES WITH ETOPS;
 M2265 (bottle 2 aft)

 (c)  
Fire bottle
 1) Bottle 1 M2248

 (d)  
CARGO FIRE panel

 (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 812-013
 (1)  Examine the fire bottle.
 (a)  Weigh the bottle.
 NOTE: The purpose of weighing the bottle is to determine if
____ the bottle is empty, or not. Therefore, the weight of the bottle can not vary more than 10% of the weight stamped on the bottle.
 1)  These are the tasks (26-23-01/401):
 -
Cargo Fire Extinguisher Bottle Removal

 -
Cargo Fire Extinguisher Bottle Installation

 (b)  
If the bottle is full, then do the Fault Isolation Procedure -Bottle Did Not Discharge, below.

 (c)  
If the bottle is empty, then do the Fault Isolation Procedure -Bottle Discharged, below.
　
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