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747-400 FAULT ISOLATION/MAINT MANUAL

APU FIRE CONTROL MODULE, M869
C APU Fire Extinguishing System - Component Location Figure 102 (Sheet 2)
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747-400 FAULT ISOLATION/MAINT MANUAL

DISCHARGE ASSEMBLY
SEE
ERUPTURE
DISK (REF)
APU FIRE EXTINGUISHER BOTTLE, M103
SCREEN (REF)

D
(DISCHARGE CARTRIDGE)
ASSEMBLY (REF)
DISCHARGE ASSEMBLY

APU Fire Extinguishing System - Component Location
Figure 102 (Sheet 3)

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747-400 MAINTENANCE MANUAL
 APU FIRE EXTINGUISHING SYSTEM - ADJUSTMENT/TEST
_______________________________________________
 1.  General_______
 A.  This procedure contains two tasks. These tasks have an operational test and a system test of the fire extinguishing system for the auxiliary power unit (APU).
 B.  The bottle for the APU fire extinguishing is found on the forward side of the APU firewall. Access to the bottle is through the access door, 315AL.
 C.  The operational test verifies the correct operation of the system in a minimum of time, and uses only the equipment installed on the airplane.
 D.  The system test verifies all the necessary performance of the system for the APU fire extinguishing.
 TASK 26-22-00-715-001
 2.  Operational Test________________
 A.  References
 (1)  
AMM 06-09-00/201, Empennage (Major Zone 300) Access Doors and Panels

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

 (3)  
IPC 26-22-01 Fig.2

 (4)  
WDM 26-22-11, Fire Extinguishing - APU

 (5)  
SSM 26-22-01

 B.  Access
 (1)  Location Zone
 220 Control Cabin

 C.  Prepare for the Test
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Make sure these circuit breakers, on the main power distribution panel, P6, are closed:

 (a)  
6H5, FIRE EXTINGUISHER APU

 (b)  
6L4, FLIGHT DECK LIGHT CAPT IND

 D.  Procedure
 S 865-005
 (1)  Push and hold the TEST 1 switch on the squib test module, M7327, on the P461 panel.
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747-400
MAINTENANCE MANUAL

BTL A  BTL B 
DISCH  a  aDISCH 

BTL A  BTL B 
DISCH  a  DISCH  a 

r w FWD ARMED  r w AFT ARMED 

APU Fire Extinguishing System Test
Figure 501 (Sheet 1)

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747-400
MAINTENANCE MANUAL

ASSEMBLY
DISCHARGE CARTRIDGE (SQUIB) ASSEMBLY

APU Fire Extinguishing System Test
Figure 501 (Sheet 2)
　
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