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Corrosion Inspections

At periodic inspections all equipment must be examined for corrosion. Without such examinations and removal of any corrosion found, an aircraft can be seriously damaged. Locations to examine include unpainted aluminum surfaces, skin seams, and lap joints. Nicks and crevices where traces of cleaning compound may have accumulated and unexposed areas where moisture can accumulate must also be inspected for corrosion. Locations where corrosion can form and that require examination include possibly plugged drain holes, structures under floorboards, and jointed surfaces.

Fittings, braces, and compound parts inside the aircraft must be inspected for corrosion because of possibly faulty drainage or disposal outlets. Inspections for corrosion must be made where dissimilar metals contact or where spot welds, piano-type hinges, and exhaust-gas paths are located. Wheel wells, landing gear, dive brakes and similar areas, heavy or tapered aluminum skin surfaces, battery boxes and components, and relief tube outlets must also be inspected as possible sites for corrosion.

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