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 1.  General_______
 A.  The fire extinguishing system for the engine has two fire bottles in each wing leading edge, a fire control module, and a squib test module. Each bottle has plumbing to the two engines on the wing.
 B.  This section contains an operational test and a system test of the engine fire extinguishing system.
 (1)  
The operational test makes sure the system operates correctly. It can be done on a minimum of time and uses only the equipment installed in the airplane.

 (2)  
The system test has different tests for each part of the system. When all the tests are done, the fire extinguishing system is ready to operate correctly. The system test include these tasks:

 (a)  
Squib Discharge Circuit Test

 (b)  
Tubing System Test

 (c)  
Pressure Switch Test

 

 TASK 26-21-00-715-001
 2.  Operational Test________________
 A.  References
 (1)  
AIPC 26-21-03, Fig. 1

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
WDM 26-21-01, WDM 26-21-02, WDM 26-21-03, WDM 26-21-04

 B.  Access
 (1)  Location Zone
 221 Control Cabin LH
 222 Control Cabin RH

 C.  Prepare for Tests
 S 865-003
 (1)  Open the following circuit breakers and attach DO-NOT-CLOSE identifiers:
 (a)  P6, Main Power Distribution Panel
 1) 6H1, FIRE EXTINGUISHER ENG 1&3 B
 2) 6H2, FIRE EXTINGUISHER ENG 1&3 A
 3) 6H3, FIRE EXTINGUISHER ENG 2&4 B
 4) 6H4, FIRE EXTINGUISHER ENG 2&4 A

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 26-21-00
 ALL  ú ú 02 Page 501 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

ENGINE FIRE
SWITCH
ENGINE FIRE
FLIGHT COMPARTMENT
BOTTLE DISCHARGE LIGHT (AMBER)

SQUIB OK INDICATOR LIGHT (GREEN)

Engine Fire Extinguishing System Test
Figure 501 (Sheet 1)

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 26-21-00
 ALL  ú ú 02 Page 502 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE  C 
OUTBD 
DISCHARGE PORT OUTBOARD ENGINE  FWD MOUNTING BOLTS (4 PLACES PER BOTTLE) BOTTLE A DISCHARGE PORT INBOARD ENGINE DISCHARGE PORT INBOARD ENGINE 
BOTTLE B 
DISCHARGE PORT OUTBOARD ENGINE 
C 

Engine Fire Extinguishing System Test
Figure 501 (Sheet 2)

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 26-21-00
 ALL  ú ú 01 Page 503 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Squib Circuit Continuity Test
 S 865-004
 (1)  
Close the circuit breaker, 6H2, FIRE EXTINGUISHER 1&3 A on the P6 panel.

 S 865-005

 (2)  
Push and hold the TEST 1 button on the, M7327, squib test module on the, P461, pilot's overhead maintenance panel.

 (a)  
Make sure the ENG 1, and 3 lights come on.

 (b)  
Make sure the ENG 2 and 4 lights do not come on.

 

 S 865-008
 (3)  Release the TEST 1 button.
 (a)  Make sure the ENG 1 and 3 lights go off.
 S 865-010
 (4)  Push and hold the TEST 2 button on the, M7327, squib test module on the P461 panel.
 (a)  
Make sure the ENG 1 and 3 lights come on.

 (b)  
Make sure the ENG 2 and 4 lights do not come on.

 S 865-013
 (5)  Release the test button.
 (a)  Make sure the ENG 1 and 3 lights go off.
　
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