(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.

 B.  Possible Causes
 (1)  
Wiring

 (2)  
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)

 (3)  
Fire bottle

 (a)  Bottle 1 M2248

 (4)  
CARGO FIRE panel

 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 26-23-11

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 E.  Initial Evaluation
 (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: Cargo Fire Extinguisher Bottle Removal (AMM 26-23-01/401) Cargo Fire Extinguisher Bottle Installation (AMM 26-23-01/401)
 (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.

 F.  Fault Isolation Procedure - Bottle Did Not Discharge
 (1)  
Do this check of the squib circuit:

 (a)  
On the CARGO FIRE panel, push the TEST switch.

 (b)  
Make sure the EXT FWD and AFT lights come on.

 (c)  
If the lights do not come on when the TEST switch is pushed, then do this task: Squib Test Light - Fault Isolation (AMM 26-23-00/101)

 (d)  
If all the lights come on for the both EXT TEST switch positions, then continue.

 (2)  
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 installation test for the CARGO FIRE panel is satisfactory, then you corrected the fault.
 G.  Fault Isolation Procedure - Bottle Did Discharge
 (1)  AIRPLANES WITHOUT ETOPS;
 do this check of the pressure switch wiring.

 (a)  
Remove the connector D12792 from the pressure switch.

 (b)  
Install a jumper between pins 2 and 3 on the pressure switch connector. 1) If the DISC light on the CARGO FIRE panel comes on, then do

 these steps:
 a) Remove the jumper.

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 b)  Replace the fire bottle. These are the tasks: Cargo Fire Extinguisher Bottle Removal (AMM 26-23-01/401) Cargo Fire Extingisher Bottle Installatino (AMM 26-23-01/401)
 c)  If the installation test for the fire bottle is satisfactory, then you corrected the fault.
 (c)  If the DISC light on the CARGO FIRE panel does not come on, then remove the jumper and continue.
 (2)  AIRPLANES WITH ETOPS do this check of the pressure switch wiring:
　
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