(9)  
Apply the fillet seal around the valve base.

 S 394-020
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747-400 MAINTENANCE MANUAL
 S 394-052
 (10)
 Apply the sealant around the base and over the top of the nuts (AMM 28-11-00/801).

 S 434-021

 (11)
 On the fuel sump drain valve with the drain line, put the new packing on the fitting and install the fitting on the valve housing.

 S 434-045

 (12)
 Tighten the fitting.

 S 434-022

 (13)
 On the fuel sump drain valve with the drain line fitting, connect the drain line coupling to the fitting on valve housing.

 S 434-046

 (14)
 Tighten the coupling.

 S 414-023

 (15)
 If you replace the sump drain valve in the center wing tank, install the access door No. 3131AZ for the spanwise beam (AMM 28-11-09/401).

 S 864-024

 (16)
 Get out of the tank and close the tank (AMM 28-11-00/201).

 S 654-025

 (17)
 If the sump drain valve in the fuel tank was replaced, fill the applicable fuel tank with fuel (AMM 12-11-01/301).

 (18)
 Make sure the sump drain valve does not have a leak.

 S 794-026
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747-400 MAINTENANCE MANUAL
 MID SPAR ACCESS DOOR - REMOVAL/INSTALLATION
___________________________________________
 1.  General_______
 A.  This procedure contains instructions for the removal and installation of the mid spar access door(s).
 B.  The access doors are found in the fuel tank on the mid spar web of the wing. The mid spar access door installation is the same for all locations.
 C.  To remove a mid spar access door, you must defuel and purge the
 applicable outboard main tank.

 TASK 28-11-25-004-002
 2.  Mid Spar Access Door Removal____________________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-02/401, Main Tank Access Door

 B.  
Access

 (1)  
Location Zones
 546 Outbd Main Tank , Mid Spar, Left
 552 Outbd Main Tank , Mid Spar, Left
 646 Outbd Main Tank, Mid Spar, Right
 652 Outbd Main Tank, Mid Spar, Right

 (2)  
Access Panels
 546BZ Outbd Main Tank , Mid Spar, Left
 552AZ Outbd Main Tank , Mid Spar, Left
 552BZ Outbd Main Tank, Mid Spar, Left
 552CZ Outbd Main Tank, Mid Spar, Left
 552DZ Outbd Main Tank, Mid Spar, Left
 552EZ Outbd Main Tank, Mid Spar, Left
 552FZ Outbd Main Tank, Mid Spar, Left
 552GZ Outbd Main Tank, Mid Spar, Left
 552HZ Outbd Main Tank, Mid Spar, Left
 646BZ Outbd Main Tank, Mid Spar, Right
 652AZ Outbd Main Tank, Mid Spar, Right
 652BZ Outbd Main Tank, Mid Spar, Right
 652CZ Outbd Main Tank, Mid Spar, Right
 652DZ Outbd Main Tank, Mid Spar, Right
 652EZ Outbd Main Tank, Mid Spar, Right
 652FZ Outbd Main Tank, Mid Spar, Right
 652GZ Outbd Main Tank, Mid Spar, Right
 652HZ Otbd Main Tank, Mid Spar, Right

 C.  
Remove the Mid Spar Access Door

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747-400
MAINTENANCE MANUAL

LEFT WING SHOWN
(RIGHT WING OPPOSITE)
　
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