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28-31-07
ALL ú ú 03 Page 411 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(8) S 434-034Install lockwire between the coupling and the override/jettison pump housing.
(9) S 434-019Put a new O-ring, lightly lubricated with petrolatum, into the coupling.
S 434-035
(10)
Connect the coupling on the discharge line to the override/jettison pump housing.
S 434-036
(11)
Tighten the coupling (AMM 28-00-00/201).
S 434-037
(12)
Install lockwire between the coupling and the override/jettison pump housing.
S 414-020
(13)
Install the spanwise beam access doors, if removed (AMM 28-11-09/401).
S 864-021
(14)
Close and go out of the fuel tank (AMM 28-11-00/201).
S 414-049
(15)
Temporarily install the motor/impeller unit of the override/jettison pump (AMM 28-31-01/401).
S 654-022
(16)
Refuel the fuel tank (AMM 12-11-01/301).
S 794-023
(17)
Do a check for leaks on the override pump housing and removal check valve.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-07
ALL ú ú 03 Page 412 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 414-024
(18)
Completely install the motor/impeller unit of the override/jettison pump (AMM 28-31-01/401).
S 094-050
(19)
Remove the tail support equipment, if it is installed (AMM 07-11-08/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-31-07
ALL ú ú 03 Page 413 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUEL OVERRIDE/JETTISON PUMP DISCHARGE CHECK VALVE - REMOVAL/INSTALLATION
________________________________________________________________________
1. General_______
A. This procedure contains instructions to remove and install the discharge check valve for the override/jettison pumps.
B. A discharge check valve is installed in each override/jettison pump housing, found in the center wing tank and the inboard main tanks. The check valve is an in-line flapper type valve located in the discharge tube.
C. Access to the discharge check valves is through the applicable fuel tank access doors and, in the center wing tank, the spanwise beam access doors.
D. There is a drain hole found on the seat of the discharge check valve assembly. The drain hole is found between the flanges for the flapper valve. For the center wing and main tank override/jettison pump installations, this drain hole must be plugged. If the drain hole is not plugged, fuel can flow out of the drain hole and into the fuel tank when the fuel-feed manifold is pressurized. To plug the drain hole a pin is installed in the drain hole cavity and sealed with retaining compound or BMS 5-45 (BMS 5-45 is preferred). If there is a pin in the drain hole no maintenance action is necessary.
TASK 28-31-11-004-037
2. Discharge Check Valve Removal (Fig. 401)_____________________________
A. References
(1)
AMM 07-11-08/201, Cargo and Fuel Loading Support
(2)
AMM 28-11-00/201, Fuel Tanks
(3)
AMM 28-26-00/201, Defueling
(4)
AIPC 28-31-07 Fig. 50
B.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 132 Center Section Wing Box, Right 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
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