REPAIR FUEL TANK Continued
REPAIR OR REPLACEMENT
Plan to weld on outside of fuel tank, if possible.
Determine type of repair, overlapping or fitted patch.
Resize hole in fuel tank, to remove sharp edges or cracks, for type of patch selected.
Prepare a piece of aluminum of the same alloy and thickness as the fuel tank.
Size patch to cover hole in fuel tank.
Tack weld a small piece of aluminum upright to center of patch to hold patch for welding.
Weld patch to fuel tank. See TC 9-237 and your -20.
Break support away from patch. Discard support.
Seal weld patch with sealing compound.
Install fuel tank access cover (see your -20).
Check tank for leaks with air pressure. Main fuel tank shall not leak when charged with 20 ± 1/2 psi (138 ± 3 kPa).
Fuel carrier (see your -10).
END OF TASK
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