MIL-DTL-13931J
j.
Cracks or visible steps which may affect serviceability, functioning, appearance or safety.
k.
Corners and edges inspected for nonconformance with the requirements of the applicable
drawing.
4.5.19 Bearing of obturator parts. After assembly, the tube seating surface of each split ring shall be
very lightly coated with red lead and the breech shall be closed and opened. Surface contact of the rings
with the seating surface in the tube shall be examined to determine compliance with the bearing
requirements. After examination the red lead shall be removed from the obturator parts and the tube seat
with a clean, non-abrasive cloth.
4.5.20 Riveted joints. Rivets shall be examined visually for full formed heads concentric with the body.
Rivets shall also be inspected to establish evidence of completely filled holes and firm contact between the
joined surfaces. This inspection, which will certify the production process, will be accomplished by
destructively sectioning a prototype riveted joint assembly to determine that the rivets completely fill the
holes and effect firm contact between the joined surfaces. The sectioned joint shall be subject to
verification by the Government representative. Failure to comply with the requirements of 3.4.4.2 shall
be cause for rejection.
4.5.21 Straightening of tubes. When cannon tubes are straightened, the contractor shall certify to the
Government representative that the straightening has been conducted in conformance with the
requirements of 3.4.2.1.1.
4.5.22 Material soundness of parts. Material soundness of parts shall be inspected as specified in the
applicable QAP.
4.5.23 Marking. Parts and assemblies shall be visually examined to determine compliance with marking
requirements of item drawings or the contract, and this specification.
4.6
Inspection equipment.
4.6.1 Government inspection equipment. Drawings or stock numbers of Government designed inspection
equipment shall be obtained from the pertinent Inspection Equipment Lists of the QAP. When specified
in the contract, inspection equipment available from the Government will be furnished for usage by the
contractor and the Government representative.
4.6.2 Care and maintenance. Inspection equipment shall be kept clean and shall be properly preserved
when not in use. Special inspection equipment such as air, optical or electronic equipment shall be
repaired or cleaned by qualified personnel only. Technical assistance, if required, should be requested
from the Government representative or the Procuring Contracting Officer.
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