D. Fault Isolation Procedure - Bottle Did Not Discharge
S 812-014
(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.
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(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.
S 812-015
(2) 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 installation test for the CARGO FIRE panel is satisfactory, then you corrected the fault.
E. Fault Isolation Procedure - Bottle Did Discharge
S 812-016
(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.
b) Replace the fire bottle. These are the tasks
(AMM 26-23-01/401):
-
Cargo Fire Extinguisher Bottle Removal
-
Cargo Fire Extingisher Bottle Installatino
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.
S 812-017
(2) AIRPLANES WITH ETOPS
do this check of the pressure switch wiring:
(a)
Remove connector D12792 from the pressure switch on bottle 1.
(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 fire bottle 1. These are the tasks (AMM 26-23-01/401):
-Cargo Fire Extinguisher Bottle Removal
-Cargo Fire Extinguisher Bottle Installation c) If the installation test for the fire bottle is satisfactory, then you corrected the fault.
2) If the DISC light on the CARGO FIRE panel does not come on, then continue.
(c)
Remove connector D12816 from the pressure switch on bottle 2.
(d)
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.
b) Replace fire bottle 2. These are the tasks
(AMM 26-23-01/401):
-Cargo Fire Extinguisher Bottle Removal
-Cargo Fire Extinguisher Bottle Installation c) If the installation test for the fire bottle is satisfactory, then you corrected the fault.
2) If the DISC light on the CARGO FIRE panel does not come on, then remove the jumpers and continue.
S 812-018
(3) Do a check of the wiring from the pressure switch to the CARGO FIRE panel.
(a)
Repair the wiring.
(b)
Install a jumper between pins 1 and 2 of the pressure switch connector. 1) If the DISCH light on the CARGO FIRE panel comes on, then
you corrected the fault. Re-connect the connector to the pressure switch.
S 812-019
(4) Replace the CARGO FIRE panel, P8-75. To install it, these are the tasks (AMM 26-00-02/401):
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