S 764-016
(8)
Do a check of the bonding resistance between the refuel receptacle and the spar (AMM 20-22-01/601).
S 764-026
(9)
Make sure the bonding resistance is not more than 0.010 ohm.
S 434-017
(10)
If you replace the outboard refuel receptacle, connect the fuel line on the manual defuel valve to the refuel receptacle.
S 434-027
(11)
Install the lockwire on the fuel line of the manual defuel valve and the refuel receptacle.
S 864-028
CAUTION: MAKE SURE THE DEFUEL LEVER IS CORRECTLY POSITIONED IN THE
_______ RECESS ON REFUEL RECEPTACLE ADAPTER. IF THE DEFUEL LEVER IS NOT IN THE CORRECT POSITION, IT IS POSSIBLE TO DAMAGE THE REFUEL RECEPTACLE ASSEMBLY. IF THE REFUEL RECEPTACLE ASSEMBLY IS DAMAGED, A FUEL LEAK CAN OCCUR.
(12)
Make sure the defuel lever is correctly positioned in the recess for refuel receptacle adapter.
(13)
Install the receptacle cap on the refuel receptacle.
S 864-018
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-21-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-023
(14)
Make sure that the manual shutoff valve is closed. S 414-019
(15)
Close the doors, 521BB or 621BB, on the pressure refuel station. S 094-020
OR DAMAGE TO EQUIPMENT.
(16)
Do this task: The removal of the safety locks and the activation of the extended leading edge flaps (AMM 27-81-00/201).
S 794-024
(17)
Do this task: Retraction of the Leading Edge Flaps (AMM 27-81-00/201).
S 794-021
(18)
Do a check for leaks during the first refuel operation (AMM 12-11-01/301).
WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO
NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-21-01
ALL ú ú 01 Page 405 ú Jun 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
REFUEL VALVE CONTROL UNIT - REMOVAL/INSTALLATION
________________________________________________
1. General
_______
A. This procedure contains instructions to remove and install the control unit for a refuel valve.
B. The refuel valve control units are installed on the rear spar of each wing fuel tank. Each inboard main tank and center wing tank has two control units. Each reserve tank has one control unit.
C. You can get access to the control units in the main and reserve tanks through access panels on the bottom of the wing. You can get access to the control units for the center wing tank through the wheel wells for the wing landing gear.
D. Make sure the wing and body gear door locks are installed when you do maintenance in the wheel well area.
TASK 28-21-02-004-001
2. Refuel Valve Control Unit Removal (Fig. 401)
_________________________________
A. References
(1)
AMM 32-00-30/201, Landing Gear Door Locks
(2)
AIPC 28-26-01 Fig. 2
(3)
SSM 28-21-03, 28-21-07
(4)
WDM 28-21-22, 28-21-25, 28-21-28, 28-21-31
B.
Access
(1)
Location Zones 135 Wing Landing Gear Well, Left 136 Wing Landing Gear Well, Right 571 Rear Spar to Landing Gear Support Beam, Left 572 Landing Gear Support Beam and Rear Spar to Trailing
Edge, Left 584 Spoiler No. 2, Left 591 Rear Spar to Trailing Edge, Left 671 Rear Spar to Landing Gear Support Beam, Right 672 Landing Gear Support Beam and Rear Spar to Trailing
Edge, Right 684 Spoiler No. 2, Right 691 Rear Spar to Trailing Edge, Right
(2) Access Panels
571AB Trailing Edge Lower Access Panel
572GB Trailing Edge Lower Access Panel
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