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A

747-400 MAINTENANCE MANUAL
SEE A
EXTINGUISHER BOTTLE
M228 THRU M231

BOLT (4)
WASHER (4)
MOUNTING LUG
ELECTRICAL
CONNECTOR
PRESSURE SWITCH
SQUIB ASSEMBLY GROUND LUG
DISCHARGE
ASSEMBLY
PORT
GROUND STRAP
O-RING

DISCHARGE
CONNECTOR

ELECTRICAL CARTRIDGE (SQUIB)
ENGINE FIRE EXTINGUISHER BOTTLE
A
Discharge Cartridge (Squib) Installation Figure 401
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747-400
MAINTENANCE MANUAL

 D. Access
 (1)  Location Zone
 514 Krueger Flap No.1, Left
 614 Krueger Flap No.1, Right

 E. Procedure
 S 864-002
 (1) Apply the electrical power to the airplane (AMM 24-22-00/201).
 S 014-039
 WARNING:  MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND THE FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH THE HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THE MOVEMENT OF THE FLAP CAN CAUSE INJURIES AND DAMAGE TO THE EQUIPMENT.
 (2)  To get access to the engine fire extinguisher bottle (fire bottles), extend the applicable leading edge flap (AMM 27-81-00/201).
 S 494-004
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE LE FLAP SAFETY LOCK. THE LE FLAP CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE LOCKS CORRECTLY. THIS CAN CAUSE INJURIES AND DAMAGE TO EQUIPMENT.
 (3)  
Do this task: Extended leading edge flap deactivation and safety lock installation (AMM 27-81-00/201).

 S 044-005

 (4)
Open the applicable circuit breakers and attach a DO-NOT-CLOSE tag:

 (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
 5) 6H7 FIRE SWITCH UNLOCK

 S 034-006
 (5)  Use this table to disconnect the electrical connectors from the squibs.
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747-400
MAINTENANCE MANUAL

 ~....................................................... | BOTTLE | ELECTRICAL CONNECTOR | ......................................................... | LEFT BTL A ENG 1 SQUIB | DM228C | | LEFT BTL A ENG 2 SQUIB | DM228B | | LEFT BTL B ENG 1 SQUIB | DM229C | | LEFT BTL B ENG 2 SQUIB | DM229B | | RIGHT BTL A ENG 3 SQUIB | DM230B | | RIGHT BTL A ENG 4 SQUIB | DM230C | | RIGHT BTL B ENG 3 SQUIB | DM231B | | RIGHT BTL B ENG 4 SQUIB | DM231C | 2.............................….........................1
 S 434-042
 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.
 (6)
Put a protective cover on the fire bottle squib.

 S 024-008

 (7)
Remove the squib and the ground lug assembly.

 NOTE: Keep the ground lug assembly for the subsequent installation.
____
 TASK 26-21-04-404-013
 3. The Discharge Cartridge Installation (Squib) (Fig. 401)
　
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