21-23-02
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A
747-400 MAINTENANCE MANUAL
S 428-042
(2) Install a new section of duct insulated with the Polyimide foam insulation (BMS 8-300) (Fig. 803).
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747-400 MAINTENANCE MANUAL
MAIN DECK FIRE SHUTOFF VALVE - REMOVAL/INSTALLATION
____________________________________________________
1. General
________
A. There are five main deck fire shutoff valves.
B. The five shutoff valves are the same.
C. The shutoff valves are under the main deck floor panels forward of the wing gear wheel well in the mix bay.
TASK 21-23-03-004-015
2. Main Deck Fire Shutoff Valve Removal (Fig. 401)
____________________________________
A. References
(1)
SSM 21-28-06
(2)
WDM 21-28-61
B. Access
(1) Location Zone
241 Main Deck LH
242 Main Deck RH
C. Prepare for Removal
S 864-001
(1) Open these circuit breakers and attach DO-NOT-CLOSE identifiers:
(a)
Overhead Panel, P7
1) 7F6, MN/DK FIRE A/C SOV CONT
(b)
Left Power Distribution Center, P414 1) 414B1, MN DK FIRE AIR COND SOV-1 2) 414B2, MN DK FIRE AIR COND SOV-2 3) 414B3, MN DK FIRE AIR COND SOV-3 4) 414B10, MN DK FIRE AIR COND SOV-4 5) 414B11, MN DK FIRE AIR COND SOV-5
S 014-014
(2) Remove the floor panels that are over the shutoff valves at these locations:
NOTE: Remove the cargo handling hardware, as required,
____ to get access to the applicable floor panels.
(a)
Shutoff valve 1 STA 1130, RBL 45
(b)
Shutoff valve 2 STA 1150, RBL 45
(c)
Shutoff valve 3 STA 1150, LBL 45
(d)
Shutoff valve 4 STA 1170, LBL 45
(e)
Shutoff valve 5 STA 1170, RBL 45
S 034-003
(3) Disconnect the electrical connector from the valve:
(a)
DV544, Shutoff valve 1
(b)
DV545, Shutoff valve 2
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747-400 MAINTENANCE MANUAL
MAIN DECK FIRE SHUTOFF VALVE (EXAMPLE)
SEE A
NO. 1 FIRE SOV
FLIGHT DECK FLOW
NO. 2 REGULATING VALVE
NO. 5
(REF)
NO. 3
NO. 4
FWD MIX BAY
VALVE
ACTUATOR
MAIN DISTRIBUTION MANIFOLD
ELECTRICAL
CONNECTOR
VALVE FIRE SHUTOFF
(2 LOCATIONS) COUPLING A
Main Deck Fire Shutoff Valve Installation Figure 401
C22825
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747-400 MAINTENANCE MANUAL
(c)
DV546, Shutoff valve 3
