28-11-00
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747-400 MAINTENANCE MANUAL
~.............................................................................. | CORROSION | | | CURE TIME | CURE TIME | |RESISTANT FINISH | CURE TIME BEFORE | CURE TIME | BEFORE | BEFORE | |(BY MANUFACTURER)|FUEL EXPOSURE *[1]|BEFORE TRAFFIC|ASSEMBLY *[1]|SEALING *[2]| ................................................................................
|Bostick West |12 hours at 65°F |12 hours at |12 hours at |Fig. 702 |
|(BMS 10-20, |or higher, or |65°F or |65°F or |*[3] |
| Type 2) |Fig. 702 *[3] |higher, or |higher, or | |
| | |Fig. 702 *[3] |Fig. 702 *[3]| |
................................................................................ |Desoto |Fig. 703 *[3] |24 hours at |Fig. 704 or |N/A | |(MIL.C.27725) | |65°F or |240 hours at | | | | |higher |65°F or | | | | | |higher *[3] | | ................................................................................ |Products Research|Fig. 705 |24 hours at |240 hours at |N/A | |(MIL.C.27725) | |65°F or |75°F and | | | | |higher |minimum of | | | | | |30 percent | | | | | |relative | | | | | |humidity | | 2.................…..................…..............….............…............1 *[1] Do the fuel resistance check to make sure the cure is completed. *[2] Do the solvent resistance check to make sure the cure is completed. *[3] Let the finish dry a minimum of 30 minutes at the temperature you applied
it at, before you cure the finish at a higher temperature.
Corrosion Resistant Finish Cure Time Table 702
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28-11-00
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747-400 MAINTENANCE MANUAL
FUEL TANKS - REPAIRS
____________________
1. General_______
A. This procedure has these tasks:
(1)
Repair of Fuel Tank Corrosion
(2)
Repair of Sealant Leaks in the Fuel Tank Structure
(3)
A task to put fuel into the repaired fuel tanks
(4)
Repairs of O-rings and Rubber Seals
(5)
Replacement of the Molded Rubber Door Seal
(6)
Repair of Secondary Fuel Barrier Sealant
B.
This procedure also contains information on how to prepare, use and cure the sealant materials. The sealant and finish materials recommened for use in this procedure and in AMM 28-11-00/701 can be used with each other (mutually compatible). Do not apply sealant over an old primer coating unless you know the primer is compatible with the new sealant.
C.
Before you repair a leak, make an analysis of the source and cause of the leak with the Fuel Leak Detection procedure (AMM 28-11-00/601).
D.
If the cause of the fuel leak is a result of structural damage, do the structural repair. Refer to the Structural Repair Manual before you apply sealant.
TASK 28-11-00-308-218
2. Repair of Fuel Tank Corrosion_____________________________
A. General
(1)
This procedure contains the task to do small corrosion repairs. Corrosion can make the structure weak. Before you do a corrosion repair refer to the Structural Repair Manual to calculate if the structure is weak.
(2)
To repair fuel tank corrosion, the applicable surfaces in the fuel tank must be cleaned and treated with etchant and alodine. Corrosion resistant finish (topcoat) is then applied to the surfaces to prevent more corrosion. Be careful to clean and treat all corners, crevices and other limited access areas.
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