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Firinq pin protrusion and retraction |
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|  MIL-C-45975B(AR)
equivalent gage.
Failure to comply with the requirements of 3.4.5 shall be cause
for rejection.
4.7.4.2 Firinq pin protrusion and retraction. Firing pin protrusion and
retraction shall be gaged on each cannon with the gages prescribed in the
applicable item QAP, or with Government approved equivalent gages. Failure to
comply with the requirements of 3.4.6 shall be cause for rejection.
4.7.4.3 Material soundness.
4.7.4.3.1 Tube. The outer and inner surfaces of each tube shall be magnetic
particle inspected in accordance with applicable drawings, QAPs, and
specifications. A borescope shall be used during inspection of the tube bore.
Failure to comply with the requirements of 3.5.2 shall be cause for rejection.
4.7.4.3.2 Breech and muzzle brake. All surfaces of each breechblock, breech
ring, and muzzle brake shall be magnetic particle inspected in accordance with
applicable drawings, QAPs, and specifications. Failure to comply with the
requirements of 3.5.2 shall be cause for rejection.
4.7.4.4 Packaging. The inspections to determine compliance with the packaging
requirements of Section 5, for the level of protection required in the contaract,
shall be as specified in MIL-STD-2073-1.
4.7.5 Functional inspection.
4.7.5.1 Breech mechanism and firing mechanism. This inspection shall be done
either manually or through the use of a functional tester. A minimum of five
complete cycles of breech operation shall be performed on each breech mechanism
and firing mechanism. Each time the breechblock assembly reaches the fully closed
position, the firing mechanism block assembly shall be cycled between the load,
the extract, and the firing positions. Each time the firing mechanism block
assembly is cycled into the firing position, the lever shall be pulled and
released. Failure to comply with the requirements of 3.4.1, 3.4.2, and 3.4.4
shall be cause for rejection.
4.7.5.2 Obturator qroup. The obturator group surfaces and the bearing of the
obturator parts shall be inspected by using applicable inspection equipment
prescribed in applicable item QAPs, or by using Government approved equivalent
inspection equipment. Failure to comply with the requirements of 3.4.3 shall be
cause for rejection.
4.7.6 Tests and test methods.
4.7.6.1 Proof acceptance. Cannon shall be accepted through proof firing,
simulation testing, or both. Failure to comply with 3.5 shall be cause for
rejection.
4.7.6.1.1 Breech mechanisms. Each breech mechanism, including all breech
mechanisms which are a part of cannon to be proof fired, shall be simulation
tested using the method of 4.7.6.2.1.
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