S 024-008
(7)
Remove the float valve and gasket from the tank.
TASK 28-13-02-404-009
3. Fuel Vent Float Valve Installation (Fig. 401)
__________________________________
A. References
(1)
28-11-00/201, Fuel Tanks
(2)
28-11-09/401, Spanwise Beam Access Door
(3)
IPC 28-13-01 Fig. 1
B.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 552 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 652 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right
(2)
Access Panels
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
131DZ Spanwise Beam Access Door
132AZ Spanwise Beam Access Door
132BZ Spanwise Beam Access Door
552AB Fuel Tank Access Door
552FB Fuel Tank Access Door
652AB Fuel Tank Access Door
652FB Fuel Tank Access Door
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A
747-400
MAINTENANCE MANUAL
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A
747-400
MAINTENANCE MANUAL
VALVE
FLOAT
SCREW NUT WASHER (4 LOCATIONS)
GASKET
VENT TUBE
MOUNTING FLANGE
FUEL VENT FLOAT VALVE VENT FLOAT
(EXAMPLE)
VALVES FRONT SPAR
VENT DRAIN
A
VALVES WS 1168
MID TUBE VENT DRAIN SPAR
OUTBOARDVENT MAIN TANKTUBE
RESERVE VENT DRAIN
TANK VALVES
WS 1196 VENT DRAIN VALVES WS 1140 WS 752 VENT DRAIN TUBE WS 670
FRONT SPAR
FUEL VENT FLOAT VALVE VENT FLOAT B
VALVES
VENT TUBE INBOARD MAIN TANK
MIDSPAR
OUTBOARD MAIN TANK VENT DRAIN
WS 724 VALVES
FUEL VENT FLOAT VALVE
C
Fuel Vent Float Valve InstallationFigure 401 (Sheet 2)
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A
747-400 MAINTENANCE MANUAL
C. Procedure
S 424-010
(1)
Put the gasket and valve in their positions on the mounting flange.
S 434-011
(2)
Install the screws, nuts, and washers (4 locations) that attach the valve to the vent tube.
S 714-012
(3)
Make sure the float and valve moves freely and its movement is not limited by the adjacent structure.
S 414-013
(4)
Install the spanwise beam access doors, if removed
(Ref 28-11-09/401).
S 864-014
(5)
Go out of and close the fuel tank (Ref 28-11-00/201).
TASK 28-13-02-004-015
4. Fuel Vent Drain Valve Poppet and Float Assembly Removal (Fig. 402)_______________________________________________________
A. References
(1)
28-11-00/201, Fuel Tanks
(2)
28-11-02/401, Reserve and Wing Tank Access Door
(3)
28-11-09/401, Spanwise Beam Access Door
(4)
28-26-00/201, Defueling
(5)
IPC 28-13-01 Fig. 1
