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 (5)  S 167-005Use the exhaust fan and hoses to move exhaust air from the fuel tank to an open space away from the work area or hangar.
 (6)  S 217-048Examine the internal fuel tank and tubing surfaces for fungus (mildew) and corrosion.
 NOTE:____ A slimy, black layer on the inner surfaces of the fuel tank, soon after defueling, shows fungus contamination. As it drys, the layer becomes solid and turns light brown in color.
 (a)  If there is fungus or corrosion, clean the fuel tank.
 (7)  S 147-049Remove all loose finish with wood or plastic scrapers and sand with aluminum oxide abrasive paper or abrasive disks. (a) Do a check for loose finish on the surfaces adjacent to those with loose finish and other areas you are not sure about. 1) Apply a strip of pressure sensitive tape to the applicable surface. 2) Push on the pressure sensitive tape with constant and hard pressure. 3) Pull the pressure sensitive tape off the surface with a quick movement, vertical to the surface. 4) Examine the surface and the pressure sensitive tape for signs of loose finish. a) If there are signs of loose finish, remove the loose finish.

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MAINTENANCE MANUAL

 (8)  S 127-006Use wet abrasive paper to make all finish areas and adjacent areas you will apply a layer to, rough.
 (9)  S 167-007Use cloths soaked in cleaning solvent and rub all unwanted materials from the applicable surfaces.
 S 167-008

 (10)
 Use clean cloths to make the surfaces dry.

 S 167-009

 (11)
 Remove by suction all unwanted materials from the fuel tank.

 S 377-010

 (12)
 If alodine metal surface treatment is worn or damaged, apply alodine metal surface solution before you apply the finish.

 CAUTION: USE ONLY ALODINE 600 TO REPAIR ALUMINUM WING SURFACES.
_______ PRIMER ADHESION PROBLEMS CAN OCCUR IF OTHER ALODINE SOLUTIONS ARE USED.
 (a)  Apply an alodine layer to the surface with Alodine 600 (SRM 51-20-01).
 S 397-011
 (13)
 Apply sealant if it is necessary because of removal of corrosion resistant finish (AMM 28-11-00/801).

 S 217-012

 (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, Series 81 (AMM 20-30-81/201, SOPM 20.31.81) before you apply the corrosion resistant finish.
　
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