S 434-011
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747-400
MAINTENANCE MANUAL

SEE A
CENTER WING 
TANK ACCESS 
DOOR  JACK PAD 
ACCESS DOOR 
FILLET 
FAIRING 
WORK PLATFORM 

A

Center Wing Tank Access Work Platform Installation
Figure 401

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747-400
MAINTENANCE MANUAL

CENTER WING TANK ACCESS DOOR

Center Wing Tank Access Door Installation
Figure 402

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MAINTENANCE MANUAL

 S 214-012

 (3)  
Make sure the metal seal ring installed in the access door is not damaged.

 (a)  
If the seals on the seal ring are damaged, replace the seal ring.

 S 164-013
 (4)  
Clean the surfaces that seal, the seal ring, and the fuel tank opening.

 S 434-014

 (5)  
Put the metal seal ring on the access door.

 S 424-015

 (6)  
Put the access door and the metal seal ring into the opening of the fuel tank.

 (a)  
Turn the door into its correct position.

 S 434-016
 (7)  
Install the bolts, washers and fiber washers (32 locations) (Fig. 402).

 S 424-028

 (8)  
Tighten the bolts to a torque of 68 to 83 inch pounds.

 NOTE:____Do not over-torque the bolts. You can crush the fiber washers.
 S 864-022
 (9)  
Supply the electrical power to the airplane (AMM 24-22-00/201).

 S 864-026

 (10)
 Refuel the center wing tank with a minimum of 70,000 lbs (31,800 kgs) of fuel (AMM 12-11-01/301).

 S 794-018

 (11)
 Make sure the access door for the center wing tank does not have a leak.

 (12)
 Remove the work platform (Fig. 401).

 (13)
 Install the fillet fairing (AMM 53-51-01/401).

 S 944-019
 S 414-020
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 S 864-023
 (14) Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 RESERVE AND MAIN TANK ACCESS DOOR - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure contains instructions for the removal and installation of the access door for the reserve and main tanks.
 B.  The access doors are found on the bottom of the wing, between the front and rear spars. The door installation is the same for all locations. Some of the doors contain a fuel measuring stick that you must remove before the door removal.
　
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