G. Visual Inspection
(1)
General Information
(a)
Visual inspection involves viewing the part for general appearance in an effort to locate conditions, which cause or indicate abnormal wear. Whenever these conditions exist, the inspector shall refer to dimensional inspection requirements in the applicable manual related to damaged part to decide if rework is feasible.
(b)
Where no evidence of damage or wear is present, the inspector shall determine if dimensional inspection is required. After a decision has been reached, the part shall be tagged accordingly in the manner utilized by the particular overhaul facility. The disposition of the part shall then be noted on the inspection records.
(c)
Parts, which are normally replaced at each overhaul, shall be given cursory inspection, since damage to these parts may sometimes reflect malfunction of other components. This is not only a good assumption to make about parts normally replaced, but shall be considered when any part has been damaged. Certain special visual inspections, required for some parts, are reflected in the following steps.
(d)
Information in this section supplements model-specific visual inspection requirements in the applicable inspection manual and/or workscope planning guide.
(2)
Inspect parts in accordance with the following procedures:
.
Threaded parts
. Check threaded parts for stripped, galled, or crossed threads.
.
Threaded inserts
. Check thread inserts for security and condition of threads.
.
Threaded Keensert inserts
. Check thread insert for security and condition of threads.
.
Threaded Keensert studs . Check threaded portion for stripped, galled or crossed threads. . Check stud for security. Axial movement of stud shall not exceed 0.0076 inch
(0,1930 mm). No rotational movement of stud is allowed. . If axial movement of stud exceeds limits specified in Sub-step (b) above, refer to Repair, Section IV.
.
Bearing bores and diameters . Check all bearing bores and diameters for corrosion, wear and scoring.
Inspection
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20-00-02/70-00-01
. All bearing bores and diameters shall be free of obvious damage. Radial scoring lines not exceeding 0.005 inch (0,127 mm) in width or 0.005 inch (0,127 mm) in depth, which do not cover more than 30 percent of bearing surface and do not penetrate protective coating, dry-film lubricant, or other finishes applied to base metal of the bore or diameter, are acceptable.
.
Plated surfaces
. Check dry-film lubricated, plated, anodized, and painted parts for wear through to base metal.
.
Press-fitted parts
. Visually check press-fitted bearings, bushings, pins, plugs, sleeves, spacers, and restrictors for security and condition.
.
Sealing surfaces and flanges . Visually check all sealing surfaces and flanges for nicks, dents, and scratches.
.
Passageways . Visually check all air and oil passageways for corrosion and foreign obstructions.
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