S 864-002
(2)
Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:
(a) 6H6, FIRE EXTINGUISHER LOWER CARGO
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A
747-400
MAINTENANCE MANUAL
SEE A
EXTINGUISHER BOTTLE M7906 THRU M7908, M6742
GLAND NUT
DISCHARGE
PORT
O-RING GROUND STRAP
GROUND LUG
ELECTRICAL ASSEMBLY
CONNECTOR
DISCHARGE CARTRIDGE (SQUIB)
FIRE EXTINGUISHER BOTTLE A
Lower Cargo Compartment Fire Extinguisher
Discharge Cartridge (Squib) Installation
Figure 401
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A
747-400
MAINTENANCE MANUAL
S 034-003
(3) Disconnect the electrical connector from the applicable squib as shown in the table that follows: ~................................................. | BOTTLE | ELECTRICAL CONNECTOR | ................................................... | BOTTLE A FWD SQUIB | DM7906B | ................................................... | BOTTLE A AFT SQUIB | DM7906C | ................................................... | BOTTLE B FWD SQUIB | DM7907B | ................................................... | BOTTLE B AFT SQUIB | DM7907C | ................................................... | BOTTLE C FWD SQUIB | DM7908B | ................................................... | BOTTLE C AFT SQUIB | DM7908C | ................................................... | BOTTLE D FWD SQUIB | DM6742B | ................................................... | BOTTLE D AFT SQUIB | DM6742C | 2.......................….........................1
S 534-059
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.
(4)
Put a protective cover on the fire bottle squib.
(5)
Remove the squib.
(6)
Remove the squib and ground lug assembly.
S 034-005
S 024-006
NOTE: Keep the ground lug for installation.
____
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A
747-400 MAINTENANCE MANUAL
TASK 26-23-02-404-007
3. Install the Discharge Cartridge (Squib) (Fig. 401)
_______________________________
A. Equipment
(1)
Voltmeter - with a 10k ohm or greater
resistance
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AIPC 26-23-01, Fig. 2
(3)
WDM 26-23-11, WDM 26-23-12
C.
Access
(1)
Location Zone 124 Forward Cargo Container Compartment Aft Half
D.
Squib Electrical Connection Procedure
NOTE: Do this procedure each time you connect an electrical connector to
____
a fire bottle squib.
S 864-063
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 BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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