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9/8/98 AC 43.13-1B SECTION 5. VISUAL CORROSION INSPECTION GUIDE FOR AIRCRAFT 6-63. GENERAL. This guide provides a general inspection checklist for those parts or surfaces that can be visually inspected without disassembly of the aircraft. It is intended for use in establishing corrosion inspection areas for which the manufacturer has not provided a recommended corrosion inspection program. The manufacturer’s recommended corrosion inspection program will take precedence over this guideline. These inspections should be accomplished in conjunction with other pre ventive maintenance. 6-64. EXHAUST TRAIL AREAS. a. Visually inspect paint in areas of the exhaust trails for damage. b. Visually inspect under fairings, around rivet heads, and in skin crevices, for corrosion in areas of engine exhaust trail. 6-65. BATTERY COMPARTMENTS AND BATTERY VENT OPENINGS. a. Inspect battery compartment for electrolyte spillage, corrosion, and condition of protective paint. b. Inspect area around battery vent for corrosion. 6-66. LAVATORIES AND GALLEYS. Inspection areas around lavatories, sinks, and ranges for spillage and corrosion. Pay par ticular attention to floor area and the area be hind and under lavatories, sinks, and ranges. 6-67. BILGE AREAS. a. Inspect bilge areas for waste hydraulic fluids, water, dirt, loose fasteners, drill chips, and other debris. b. Remove any foreign material from bilge and inspect for corrosion. 6-68. WHEEL WELLS AND LANDING GEAR. Inspect wheel well area and landing gear components for damage to exterior finish coating and corrosion. Particular attention should be given to exposed surfaces of struts, oleos, arms, links, and attaching hardware; axle interiors, exposed position indicator switches and other electrical equipment; crev ices between stiffeners, ribs, and lower skin surfaces; magnesium wheels, particularly around bolt heads, lugs, and wheel web areas; and exposed rigid tubing at “B” nuts and fer rules under clamps, and tubing identification tapes. 6-69. EXTERNAL SKIN AREAS. a. Inspect external skin surfaces for damage to protective finishes and corrosion. b. Inspect around fasteners for damage to protective finishes and corrosion. c. Inspect lap joints for bulging of skin surface, which may indicate the presence of corrosion between the faying surfaces. Skin cracks and/or dished or missing fastener heads may also indicate severe corrosion in bonded joints. d. Inspect area around spot welds for bulges, cracks, or corrosion. e. Inspect piano type hinges for corro sion. When piano hinges are inspected they should be lubricated and actuated through sev eral cycles to ensure complete penetration of the lubricant. Par 6-63 Page 6-15PDF Image | AFS-640
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