(f)
Make sure that the clamp ring and the gasket holes align.
(g)
Push the clamp ring on the gasket until the clamp ring is tightly against the gasket.
(h)
As a unit, remove the clamp ring, the gasket, and the strip that releases, from the tray.
(i)
Put the unit, with the gasket turned up, on a flat surface.
(j)
Remove the strip from the gasket.
S 394-016
(9) If you use the initial gasket, make sure the anticorrosion grease fully fills the mesh of the gasket.
NOTE: If there is not a sufficient quantity of grease, the grease
____ can have holes that collect moisture. If you use too much grease, it can flow out of the lower wing surface.
(a)
If the gasket does not contain the correct quantity of grease, remove the grease with a lintfree cloth that is moist with a solvent.
(b)
Apply a 1/2 to 1 oz. layer of grease equally to each side of the gasket.
NOTE: Make sure the layer is continuous on the gasket.
____
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(10)
Examine the molded rubber seal on the access door.
(a)
Examine the molded rubber seal for these signs of deterioration: 1) Cuts 2) Deliminations from the access panel 3) Chafing 4) Flat spots 5) Any condition which will not allow the rubber seal to form
a fuel tight seal.
(b)
If there is a problem with the molded rubber seal, replace the seal (AMM 28-11-00/801) or the access door.
NOTE: You can remove the rubber seal on all high
____ impact-resistant access doors and all new replacement access doors (Fig. 402).
S 394-017
CAUTION:_______APPLY THE GREASE CAREFULLY. THE GREASE CAN CAUSE CONTAMINATION OF THE FUEL TANK.
(11)
Apply 0.010-0.015 inch thick layer of an anticorrosion grease to the external area of the access opening (the area where the gasket contacts wing skin).
S 424-018
(12)
Hold the access door in the tank and set it on top of the opening.
S 434-019
(13)
Set the gasket and the clamp ring into its correct position and install the mounting bolts (23 locations).
(14)
Tighten the bolts to 35-40 pound-inches.
S 434-026
NOTE: Start from the centerline and tighten the bolts equally
____
in each direction.
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S 424-041
(15) Tighten the mounting bolts to 35-40 pound-inches (4.0-4.5 newton-meters).
NOTE: Start to tighten the mounting bolts from the centerline to
____ the outboard direction and equally in both directions (Fig. 403).
S 434-020
(16)
If the access door contains a fuel measuring stick, install the housing for the fuel measuring stick (AMM 28-44-02/401).
S 654-021
(17)
Fill the applicable tank with fuel refer to Fig. 404 (AMM 12-11-01/301).
S 794-022
(18)
Make sure the access door does not have a leak.
S 874-023
(19)
If you did the removal and installation of the access door in the No. 2 main tank, remove the air from the APU fuel-feed system (AMM 28-25-00/201).
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747-400 MAINTENANCE MANUAL
WING SURGE TANK ACCESS DOOR - REMOVAL/INSTALLATION
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