(h)
Cleanup after corrosion resistant finish (topcoating) application. 1) Clean equipment with B01013 solvent, Series 93 (Ref AMM/SOPM 20-30-93) immediately after use.
2) Soak brushes in B01013 solvent, Series 93 (Ref AMM/SOPM 20-30-93) immediately after use. Discard brushes when bristles become stiff.
WARNING: DO NOT GET SOLVENT IN MOUTH, EYES, OR ON SKIN. DO NOT BREATHE THE FUMES FROM SOLVENT. SOLVENTS ARE HAZARDOUS MATERIALS. REFER TO PRODUCT MATERIAL SAFETY DATA SHEETS (MSDS) AND LOCAL REQUIREMENTS FOR PROPER HANDLING PROCEDURES.
5. Nonsealant Leaks Approved Repairs
A. General
(1) The repair of nonsealant leaks consists of repairing leaks around removable plumbing fittings, primary tension bolts, tank access doors and fuel system components that penetrate fuel tank walls. These items are either sealed by O-rings or by molded rubber seals. If seals are damaged and leaking they should be replaced. Any surface damaged during O-ring and sealant removal must be realodized before new O-rings or sealants are installed (Ref par. 4.C.(7)).
B. Equipment and Materials
(1)
Air Blower (Explosionproof), with sufficient flexible hose to reach all areas inside fuel tank. Capacity to be 90 to 100 cubic feet per minute
(2)
Exhaust Fan (Explosionproof Centrifugal), with approximately 75 feet of 3-inch diameter flexible suction hose and sufficient delivery hose to carry exhausted air outside hangar or working area.
(3)
Respirator (Full Face Supplied Air Type) - U.S. Bureau of Mines Approved
(4)
Gasoline (white) -VV-G-109 (Ref 20-30-31)
(5)
Naphtha - TT-N-95 (Ref 20-30-31)
(6)
B01013 Solvent - Final Cleaning Prior to Fuel Tank Sealing (Series 93)
(Ref AMM/SOPM 20-30-93).
(7)
Petrolatum - VV-P-236 (Ref 20-30-21)
(8)
Rubber Cement - B.F. Goodrich No. 4 (Ref 20-30-11)
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May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-11-0 Page 833
C. Prepare Tank for Non-Sealant Leak Repair
(1)
Defuel and purge applicable tank (Ref 28-10-0, 28-23-0 MP)
(2)
Position air blower and exhaust fan at least 30 feet from open tank (Fig. 825).
(3)
Insert end of supply hose from air blower into overwing filler port. Support end of hose as required with shot bags.
(4)
Insert sufficient suction hose into tank to enable end of hose to be located as close as possible to work area.
(5)
Position end of delivery hose from exhaust fan outside of hangar, downwind and clear of doorway.
(6)
Attach approved ground wire to all hoses in contact with airplane and ground to an approved grounding provision.
(7)
Start air blower and exhaust fan.
(8)
Enter tank taking in required tools and replacement parts, such as O-rings, gaskets, rivets, etc.
NOTE: Keep all tools and spare parts in a plastic or cardboard container to prevent damage to sealant material.
(9)
Keep exhaust duct end as close as practical to work area while work is in progress.
D. Repair of Nonsealant Leaks
(1) O-rings are used to seal removable plumbing fittings, primary tension bolts, fuel tank access doors, and fuel system components which penetrate fuel tank walls. Some fuel tank access doors are sealed with a molded rubber seal ring, if any of these seals develop a leak the door should be replaced. You can replace the rubber seal on high impact resistant access panels without replacing the door (Ref 28-11-11/801). You must replace the entire door if the seal on a cast aluminum door develops a leak. If any O-ring seals develop a leak, they should be replaced as follows:
(a) Install O-ring. 1) Obtain proper O-ring replacement. Ascertain that cure date is less than 48
months prior to current date. 2) Remove used O-ring from assembly. 3) Clean O-ring groove and flat surface of the two assembly parts with B01013
Solvent - Final Cleaning Prior to Fuel Tank Sealing (Series 93)
(Ref AMM/SOPM 20-30-93).and wipe dry with clean gauze (Fig. 826).
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