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AC 43.13-1B 9/8/98 6-167. EXAMPLE OF REMOVING CORROSION FROM FERROUS MET- ALS. If possible, corroded steel parts should be removed from the aircraft. When impracti cal to remove the part, follow the procedure below. a. Prepare the area for rework. b. Positively identify the metal as steel and establish its heat-treated value. c. Clean the area and strip paint if re quired. NOTE: Use of acid-based strippers, chemical removers, or chemical con- version coatings are not permitted on steel parts without engineering authorization. d. Determine extent of corrosion damage. e. Remove residual corrosion by hand sanding with mild abrasive mats, cloths, and papers, such as fine aluminum oxide grit. f. Remove heavy deposits of corrosion products by approved mechanical methods for that particular form of steel and/or stainless steel. g. Inspect the area for remaining corro sion. Repeat procedure if any corrosion re mains and the structural integrity of the part is not in danger, and the part meets the rework limits established by the manufacturer or FAA authorized DER. h. Fair depressions using a blend ratio of 20:1. Clean area using 240-grit paper. Smooth area with 300-grit paper and give final polish with 400-grit paper. i. Determine depth of faired depression to ensure that rework limits have not been ex ceeded. j. Clean reworked area with dry cleaning solvent. Do not use kerosene. k. Apply protective finish or specific or ganic finish as required. NOTE: Steel surfaces are highly- reactive immediately following corro- sion removal; consequently, primer coats should be applied within 1 hour after sanding. l. Remove masking and protective cover ings. 6-168.6-178. [RESERVED.] Page 6-36 Par 6-167PDF Image | AFS-640
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