(2)
Remove electrical connector from squib.
(3)
Place metal foil or protective cap over squib.
(4)
Remove lockwire and unscrew squib from bottle. Cap squib end and cap bottle fitting.
B. Check Squib
(1) Check for damage with special attention given to the soft seal, opposite the electrical connector, which protects the explosive charge.
(a)
If seal is punctured, broken, cut and/or corroded, replace with new part.
(b)
If squib has corrosion on threads, replace with new part.
C. Install Squib
(1)
Remove cap from bottle and screw squib into bottle fitting. Tighten squib to 96 ±12 pound-inches.
(2)
Install lockwire.
(3)
Remove protective metal foil or cap from squib.
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Jun 20/89 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 26-21-31 Page 201
D. Perform Operational Test
(1)
Prepare to Test
(a)
Apply electrical power.
(b)
Check that EXTINGUISHER BOTTLES RIGHT, EXTINGUISHER BOTTLES LEFT and EXTINGUISHER BOTTLES APU circuit breakers on panel P6-2 and all IND LIGHTS, SEC 1, and SEC 5 circuit breakers on P6-3 are closed.
(2)
Operational Test
(a)
Open EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(b)
Disconnect electrical connectors (D582 and D584) from bottle discharge squibs.
(c)
Close EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(d)
Press EXT TEST press-to-test switch on P8-1 fire protection module and verify no lights illuminate except APU light.
(e)
Open EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(f)
Reconnect electrical connector D582 to the fwd bottle discharge squib.
(g)
Close EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(h)
Press EXT TEST press-to-test switch on P8-1 fire protection module.
1) Check that the L and APU lights illuminate and stay on until press-to-test switch is released.
(i)
Open EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(j)
Reconnect electrical connector D584 to the aft bottle discharge squib.
(k)
Close EXTINGUISHER BOTTLES RIGHT and EXTINGUISHER BOTTLES LEFT circuit breakers.
(l)
Press EXT TEST press-to-test switch on P8-1 fire protection module.
1) Check that the L and R and APU lights illuminate and stay on until press-to-test switch is released.
NOTE: Ground for light is through associated selector control valve. Light may not illuminate if valve is faulty.
(3) Restore Airplane to Normal Configuration
(a) Remove electrical power if no longer required.
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26-21-31 Page 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/90
ENGINE/APU FIRE CONTROL MODULE - REMOVAL/INSTALLATION
1. General
A. The engine and APU fire control module is located at the pilot's control stand.
2. Remove Fire Control Module
A. Open the circuit breakers that follow on the load control center P6:
-
EXTINGUISHER BOTTLES LEFT
-
EXTINGUISHER BOTTLES RIGHT
-
APU FIRE EXT BOTTLES
B. Loosen the module mounting screws.
C. Pull the module out and disconnect the electrical connectors.
D. Remove the module.
E. Retain the lightplate for installation.
3. Install Fire Control Panel
A. Mount the lightplate in place.
B. Connect the electrical connectors to the module.
C. Install the module and tighten the mounting screws.
D. Close the circuit breakers that follow on the load control center P6:
-
EXTINGUISHER BOTTLES LEFT
-
EXTINGUISHER BOTTLES RIGHT
-
APU FIRE EXT BOTTLES
E. Test control module installation.
(1) Perform engine and APU fire control module operational test (Ref 26-21-41 A/T).
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