MIL-DTL-85537A(AS)
c. Sampling inspection (see 4.4).
4.2 First article inspection. The first article sample shall be performed on one complete
trailer when a first article sample is required (see3.1). This examination includes the tests
specified in table I under First Article and in the sequence shown.
4.3 Conformance inspection. Each trailer shall be subjected to the tests specified in table I
under Conformance, and in the sequence shown.
4.4 Sampling inspection. Trailer components shall be inspected using sampling plans noted
on the components' detail drawings or if none are specified, as directed by the procuring activity
(see 6.2).
4.4.1 Rejection and retest. When a unit fails the inspections (see 4.2 and 4.3), no item still
on hand or later produced shall be accepted until the extent and cause of failure is determined and
resolved.
4.5 Methods of inspection.
4.5.1 Examination of product. Each trailer shall be examined visually to determine
compliance with the requirements of this specification. Each trailer shall be inspected to
determine conformance to the engineering drawings. Particular attention shall be given to routing
protection and functioning of the lighting circuits and brake lines. Dimensions and attributes not
in compliance with drawing tolerances shall not be accepted.
4.5.2 Functioning. Each trailer shall be examined to determine that wheels are correctly
aligned, that all brake systems (including back-up) function and are correctly adjusted, that the
electrical system is in working order, that all points requiring lubrication are properly lubricated,
and that the wheel bearings are properly adjusted and lubricated. To check alignment, the trailer
shall be on a level surface with front wheels straight ahead. Measure the distance between the
front wheels at hub height. Mark point where measurement was made. Roll trailer forward until
these marks are on the opposite side of the axle (180°). Measure the distance between the wheels
at hub height at this point. The difference between the two measurements is the actual toe-in, and
shall not be over 0.250 inch. If toe-in is not as stated, adjust to 0 to 0.250 inch. For adjustment,
loosen jam nuts on both ends of the tie-rods and rotate tie-rods in or out as required. To adjust
wheel bearings, jack or prop trailer to raise wheel off the ground. Spin the wheel and tighten
adjusting nut until a heavy drag is felt. Then loosen nut until wheel rotates freely and bearing end
play does not exceed 0.002 to 0.003 inch. Install cotter pin through nut and axle and replace
grease cap.
4.5.3 Overload test. Place a 17,000 (+100, -0) pound test load across the open hatchway
doors for not less than ten minutes. At completion of the test, there shall be no evidence of
permanent distortion such as warpage of trailer deck, damage such as dents or breakage of
components parts, misalignment of wheels, or other defects detrimental to the intended use.
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