(d)
If it is necessary, do this task: Apply the Corrosion Resistant Finish (Topcoat) (AMM 28-11-00/701).
TASK 28-11-00-658-148
4. Refuel Operation for the Repaired Fuel Tanks
________________________________________________
A. References
(1)
AMM 12-11-01/301, Fuel Tank - Pressure Fueling
B.
Access
(1)
Location Zones
130 Center Wing Tank
500 Left Wing
600 Right Wing
C.
Procedure
S 628-149
(1) Do not refuel the fuel tanks that you repaired until the finish is dry (cured) (Fig. 804).
NOTE: With usual conditions the cure time for the finish is a
____
minimum of 12 hours at 65°F.
S 398-150
(2)
If the you repaired the fuel tank but did not apply the finish, you can refuel the fuel tank when the sealant is not tacky.
(a)
Do not point the fuel flow against the new sealant.
(3)
Refuel the fuel tanks (AMM 12-11-01/301).
(4)
Examine the external leak area regularly for 1 hour.
S 658-151
S 218-152
NOTE: You can monitor the leak area for a longer time to make sure
____
the repair is satisfactory.
(a) Make sure there are no fuel leaks.
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747-400 MAINTENANCE MANUAL
TASK 28-11-00-378-176
5. Repair of O-Rings and Rubber Seals (Fig. 818)
__________________________________
A. General
(1)
Leaks can occur around plumbing fittings that you can remove, primary tension bolts, tank access doors and fuel system components that go through the fuel tank surfaces. These components are sealed by O-rings or by rubber seals. Replace the O-rings or rubber seals when they are damaged or have fuel leaks. You must apply the alodine layer to all surfaces of the tank structure that are damaged before you install new O-rings or rubber seals.
(2)
O-rings are used to seal these types of components:
(a)
Plumbing fittings that you can remove
(b)
Primary tension bolts
(c)
Access doors for the fuel tanks
(d)
Fuel system components that go through tank walls.
(3)
O-rings are used to seal these components:
(a)
Removable plumbing fittings
(b)
Primary tension bolts
(c)
Access doors for the fuel tank
(d)
Fuel system components that go through fuel tank walls.
(4)
If an O-ring seal has a leak, you must replace it.
(5)
The high impact-resistant and cast aluminum access doors are sealed with a rubber seal ring. If a seal on a high impact-resistant door has a leak (the seal becomes loose but has no damage), you can replace the seal. All new type replacement cast aluminum access doors will also have molded rubber seals that you can remove and replace. To replace the seal, refer to this task: Replacement of the Molded Rubber Door Seal.
B.
Consumable Materials
(1)
G00267 Gauze pads - unsterilized
NOTE: All material must contain less than 0.75 percent oil by
____
carbon tetrachloride extraction.
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747-400
MAINTENANCE MANUAL
O-RING DIAMETER
IS TOO SMALL
O-Ring Groove Preparation and Fit
Figure 818
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