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A
747-400 MAINTENANCE MANUAL
 APU FIRE EXTINGUISHER BOTTLE DISCHARGE CARTRIDGE (SQUIB) -
__________________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure contains two tasks.
 (1)  
The Discharge Cartridge (squib) Removal.

 (2)  
The Discharge Cartridge (squib) Installation.

 B.  If the squib is replaced because it has been fired, you must replace the ruptured disc and fill the fire bottle with halon.
 C.  You will find the fire bottles forward of the APU firewall in the lower left corner.
 D.  Access to the fire bottles is through access door 315AL.
 TASK 26-22-02-004-001
 2.  Discharge Cartridge (Squib) Removal (Fig. 401)___________________________________
 A.  Equipment
 (1)  Squib Protective Cover
 M83723/60-110-AN or AC
 B.  References
 (1)  
AMM 06-09-00/201, Empennage (Major Zone 300) Access Doors and Panels

 (2)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (3)  
IPC 26-22-01 Fig. 02

 (4)  
WDM 26-22-11

 (5)  
SSM 26-22-01

 C.  Access
 (1)  
Location Zone 315 Area Aft of Stabilizer Box Compartment, LH

 (2)  
Access Panel
 315AL Access Door

 D.  Procedure
 S 864-039
 WARNING:_______DO NOT TOUCH THE PNEUMATIC DUCTS WHEN THEY ARE HOT. WHEN THE DUCTS ARE HOT THEY CAN CAUSE INJURY TO PERSONS.
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags.
 (a)  P6 Main Power Distribution Panel
 1) 6H5, FIRE EXTINGUISHER APU

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747-400
MAINTENANCE MANUAL

APU FIREWALL
ACCESS DOOR SEE A
EXTINGUISHER
MOUNTING LUG
BOTTLE, M103 WASHER (4 LOCATIONS) PRESSURE
BOLT
SWITCH
(4 LOCATIONS)
ELECTRICAL CONNECTOR
DISCHARGE PORT

GLAND NUT GROUND LUG ASSEMBLY O-RING 1 DISCHARGE CARTRIDGE (SQUIB) ELECTRICAL CONNECTOR
APU FIRE EXTINGUISHER BOTTLE A
1
NOT ON KIDDE FIRE BOTTLES
APU Fire Extinguisher Bottle Discharge Cartridge (Squib) Installation Figure 401
L81901
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747-400
MAINTENANCE MANUAL

 S 034-003
 WARNING:_______DO NOT STAND ON ACCESS DOOR 315AL. THE SPRING LOADED LATCHES WILL RELEASE AND YOU WILL FALL AND INJURE YOURSELF.
 WARNING: DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURES FOR DEVICES
_______ THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE BOTTLES TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Before you touch the squib, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).

 S 864-032

 (3)  
Disconnect electrical connector DM103B from the squib.

 S 434-022
 WARNING:_______PUT A PROTECTIVE COVER ON THE FIRE BOTTLE SQUIB. IF YOU DO NOT PUT A PROTECTIVE COVER ON THE FIRE BOTTLE SQUIB, THE FIRE BOTTLE CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
 CAUTION:_______DO NOT PUT A SHUNT PLUG ON THE FIRE BOTTLE SQUIB. THE SHUNT PLUG CAN CAUSE DAMAGE TO THE SQUIB PINS.
　
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