D.
Access
(1)
Location Zones
131 Center Section Wing Box, Left
132 Center Section Wing Box, Right
(2)
Access Panels
131EZ Center Wing Tank Access Door
132CZ Center Wing Tank Access Door
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
132AZ Spanwise Beam Access Door
E.
Install the Float Valve(s)
S 864-064
WARNING:_______OBEY ALL THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE AN INJURY TO A PERSON AND CAUSE DAMAGE TO THE AIRPLANE.
(1)
Go into the center wing tank.
S 394-068
(2)
Use the sealant to apply a faying surface seal between the float valve and the structure (bracket).
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A
747-400
MAINTENANCE MANUAL
FUEL SCAVENGE SYSTEM SEE A
CENTER WING TANK (REF)
JET PUMP
FLOAT VALVE IN THE (4 LOCATIONS)
NO. 2 MAIN TANK FLOAT VALVE IN THE
SEE C NO. 3 MAIN TANK
A A
NO. 2 MAIN TANK NO. 3 MAIN TANK
(REF) (REF)
AA FUEL STRAINER HOUSING (2 LOCATIONS)
FLOAT VALVE IN THE CENTER WING TANK (2 LOCATIONS)
SEE B
FWD
FUEL SCAVENGE SYSTEM
OUTBD
A
REAR SPAR OF THE CENTER WING TANK (REF)INTERCOSTAL (REF)
FLOAT VALVE IN THE SPANWISE BEAM
MID-SPAR OF THE SPANWISE BEAM CENTER WING TANK
NO. 2 (REF) CENTER WING TANK NO. 1 (REF)
(REF) A-A Float Valves for the Fuel Scavenge System Figure 401 (Sheet 1)
A77292
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
THE CENTER WINGTANK
B-B
Float Valves for the Fuel Scavenge System
Figure 401 (Sheet 2)
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A77305
A
747-400
MAINTENANCE MANUAL
PUMPS
FLOAT VALVE IN THE NO. 2 MAIN TANK
FLOAT VALVE IN THE INBOARD MAIN TANK
Float Valves for the Fuel Scavenge System
Figure 401 (Sheet 3)
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A78553
A
747-400 MAINTENANCE MANUAL
S 424-079
(3)
Put the float valve in the correct location.
S 424-081
(4)
Attach the bolt and the washer (2 locations) but do not tighten the bolts until the couplings are attached to the float valve.
S 644-054
(5)
Lightly lubricated the new O-rings (for the couplings) with the petrolatum.
S 434-055
(6)
Install the O-rings in the couplings.
S 434-083
(7)
Manually tighten the coupling to the float valve (2 locations) until no threads are shown.
S 434-085
(8)
Tighten the bolts.
S 434-087
(9)
Install the lockwire through the couplings.
S 434-089
(10)
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