S 735-127
(26)
Make sure the nitrogen flows out of the aft compartment jet nozzles: STA 1563 RBL 6.50 STA 1723 RBL 6.50 STA 1955 RBL 3.75 STA 1983 RBL 3.75.
S 785-294
(27)
Make sure the nitrogen does not flow out of the forward compartment jet nozzels at: STA 743, RBL 6.5 STA 523, RBL 6.5
(28)
Remove pressure from the aft metered tubing.
S 085-129
(29)
Disconnect the dry nitrogen from bulkhead fitting of the aft metered tubing.
S 435-130
(30)
Remove the nozzle pressure cap from the hose which leads to the aft metered tubing.
S 865-128
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A
747-400 MAINTENANCE MANUAL
S 435-134
(31) Connect and tighten the hose to the aft discharge port of bottle C
NOTE: The color identification is used for the fire extinguishing
____ system of the cargo compartment. The yellow is used to identify the extinguishing agent supply to the forward cargo compartment. The blue is used to identify the extinguishing agent supply to the aft cargo compartment.
S 435-198
(32)
Connect and tighten the hose to the aft discharge port of bottle D.
S 415-137
(33)
Install the cargo liner at the jet nozzles.
(34)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-127
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747-400 MAINTENANCE MANUAL
LOWER CARGO COMPARTMENT FIRE EXTINGUISHER BOTTLE - REMOVAL/INSTALLATION
_______________________________________________________________________
1. General
_______
A. This procedure contains three tasks. The first task quickly discharges the remaining extinguishing agent in the metered fire bottles from a partially discharged fire bottle. The second task removes the fire bottles in the lower cargo compartment. The third task installs the fire bottles in the lower cargo compartment.
B. There are four fire extinguisher bottles installed aft of the forward cargo door on the right side of the lower cargo compartment. The two small bottles each have a volume of 1400 cubic inches. The two large bottles each have a volume of 2170 cubic inches.
TASK 26-23-01-684-047
2. Discharge the Remaining Halon in the Metered Fire Extinguisher Bottles
______________________________________________________________________
NOTE: Do this procedure to completely discharge a partially discharged fire
____ bottle. This procedure does not apply to fire bottles that have not been discharged.
A. Equipment
(1) G26002-42, Inst/Removal Equip, Fire Ext. Bottle
B. References
(1)
AMM 21-00-00/201, Air Conditioning
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 26-23-00/501, Lower Cargo Compartment Fire Extinguishing System
(4)
AMM 26-23-04/401, Filter/Dryer
(5)
WDM 26-23-11
(6)
WDM 26-23-12
(7)
AIPC 26-23-01, Fig. 02
C. Access
(1)
Location Zone 124 Forward Cargo Container Compartment Aft Half
(2)
Access Panels
125B Access Door Electronics
D. Procedure
S 864-032
(1) Find which lower cargo compartment (forward or aft) fire extinguishing system was discharged.
NOTE: On the P5 panel, the ARMED light for the discharged
____
compartment will be on.
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