28-21-13
 ALL  ú ú 01 Page 403 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Refuel Valve Unit
Figure 401

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 28-21-13
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 D. Procedure
 S 214-014
 (1)
Replace the spar gasket seal if one of these conditions occur:

 (a)  
There is damage on the spar gasket seal.

 (b)  
The spar gasket seal is not in the usual shape.

 (c)  
The spar gasket is too hard.

 S 434-015
 (2)
Put the spar gasket seal on the mounting flange of the valve unit.

 S 424-016

 (3)  
Hold the valve unit and gasket seal in the correct position on the spar in the fuel tank.

 S 434-017

 (4)  
Install the washers and nuts (3 locations) out of the tank that attach the valve unit to the spar.

 (a)  
Tighten the nuts to 35-50 pound-inches.

 S 434-018
 (5)  
Put the gasket seal and orifice plate in the correct position on the valve outlet tube flange.

 S 434-094

 (6)  
Align the outlet tube with the valve unit.

 S 434-095

 (7)  
Install the bolts and washers to attach the outlet tube with the valve unit (4 locations).

 (a)  
Tighten the bolts.

 (8)  
Install the new O-ring in the inlet tube coupling.

 (9)  
Connect the coupling to the valve body.

 S 434-019
 S 434-096
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747-400 MAINTENANCE MANUAL
 S 434-097
 (10)
 Install the lockwire to connect the coupling nut to the outlet tube bolt head.

 S 434-020

 (11)
 Install the bolt, washers, and nut to attach the bonding jumper to the grounding lug on the valve unit (AMM 20-11-15/401).

 S 764-021

 (12)
 Do a check on the bonding resistance between the valve unit and the structure (AMM 20-22-01/601).

 S 764-098

 (13)
 Make sure the bonding resistance is not more than 0.010 ohm.

 S 864-022

 (14)
 Go out of and close the fuel tank (AMM 28-11-00/201).

 S 414-023

 (15)
 Install the refuel valve control unit (AMM 28-21-02/401).

 TASK 28-21-13-004-024
 4.  Center Wing Tank Refuel Valve Unit Removal (Fig. 401)__________________________________________
 A. References
 (1)  
AMM 28-11-00/201, Fuel Tanks

 (2)  
AMM 28-11-09/401, Spanwise Beam Access Door

 (3)  
AMM 28-21-02/401, Refuel Valve Control Unit

 (4)  
AMM 28-26-00/201, Defueling

 (5)  
AIPC 28-21-02 Fig. 5

 B.
Access

 (1)  
Location Zones
 131 Center Section Wing Box, Left
 132 Center Section Wing Box, 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

 C.
Procedure

 (1)  
Defuel the center wing tank (AMM 28-26-00/201).

 S 014-026

 (2)  
Remove the refuel valve control unit from the center wing tank (AMM 28-21-02/401).

 S 654-025
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