S 167-190
(9)
Use cloths soaked in cleaning solvent, Series 81, and rub all unwanted materials from the applicable surfaces.
(10)
Use clean cloths to make the surfaces dry.
(11)
Remove by suction all unwanted materials from the fuel tank.
S 167-191
S 167-192
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747-400 MAINTENANCE MANUAL
S 377-193
(12)
If alodine metal surface treatment is worn or damaged, do the "Alodine Metal Surface Treatment" procedure before you apply the finish.
S 397-194
(13)
If sealant is damaged by removal of corrosion resistant finish, do this task: Repair of Sealant Leaks in the Fuel Tank Structure (AMM 28-11-00/801).
S 217-195
(14)
Make sure all equipment used to apply the corrosion resistant finish is clean.
(a)
If you are not sure, clean the equipment in solvent, ASTM D740, or solvent, Series 81, before you apply the corrosion resistant finish.
S 217-196
(15)
Make sure that all surfaces of the fuel tank that you apply corrosion resistant finish to are clean.
(a)
If you are not sure, clean the surfaces of the fuel tank with BMS 11-7 solvent before you apply the corrosion resistant finish.
S 217-197
(16)
Make sure the storage life of the corrosion resistant compounds that are not mixed is not expired.
(a)
The storage life of BMS 10-20, Type II, Class A is 12 months at 40° to 90° F (4.4° to 32.2° C) from the date of manufacture.
(b)
The storage life of MIL-C-27725 corrosion resistant finish coating is as follows: 1) For DeSoto 823-011 or 823-730 the storage life is 12 months
at 50° to 90° F (10.0° to 32.2° C) from the date of manufacture.
2) For Products Research Company PR-1560M, PR-1560MC, PR-1560MK the storage life is 6 months at 50° to 90° F (10.0° to 32.2° C) from the date of manufacture.
S 217-198
(17) Make sure there is sufficient corrosion resistant material to apply the corrosion resistant finish.
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747-400 MAINTENANCE MANUAL
S 957-199
CAUTION: REMOVE ALL MASKING TAPE AFTER YOU APPLY THE CORROSION RESISTANT
_______ FINISH. FAILURE TO REMOVE ALL THE MASKING TAPE COULD BLOCK THE SUCTION INLETS OF THE FUEL BOOST PUMP.
(18) Apply masking tape, 3M #250 (A-A-883), to all non structural equipment areas in the fuel tank which are near the surfaces that you apply the corrosion resistant finish (topcoat) to.
NOTE: Do not apply the corrosion resistant finish (topcoat) to
____ electrical bonding surfaces, clamps, O-rings, valves, fuel measuring sticks, tank units, wiring, pumps, filler caps or other non structural equipment.
S 227-200
(19) Make sure you keep the corrosion resistant finish at 50° to 100° F
(10.00
to 37.8° C) with less than 85 percent relative humidity while you apply it.
G.
Alodine Metal Surface Treatment
S 377-201
(1) If alodine metal surface treatment is worn or damaged, do the steps that follow before you apply topcoat:
WARNING: DO NOT GET ALODINE 600 POWDER OR PREPARED SOLUTION IN YOUR
_______ MOUTH OR EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE ALODINE POWDER OR SOLUTION. PUT ON A RESPIRATOR, GOGGLES, RUBBER OR NEOPRENE GLOVES, BOOTS AND OUTER CLOTHING. SOAK ALL MATERIALS USED TO APPLY OR REMOVE ALODINE SOLUTION IN WATER AFTER USE. ALODINE IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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