MIL-DTL-13931J
pressure and the weight of above propellent, the appropriate commodity command or arsenal
shall be informed.
b.
Specific-pressure round. A specific-pressure round shall use a standard weight projectile and
shall be loaded with a suitable propellant to give the specified percentage of the upper pressure
limit at 70 degrees F + 3 degrees F.
c.
Storage. Proof rounds shall be maintained at 70 degrees F + 3 degrees F for not less than 24
hours immediately before being fired.
4.7.3 Inspection after proof-firing. The following examinations and tests shall be performed
after proof-firing.
a. Visual examination. A visual examination shall be made of the cannon for looseness or interference
of parts and any defects in material, workmanship or function.
b. Material soundness. Examine all surfaces of the breechblock, breech ring, and bushing and the
outer surfaces of the tube by magnetic particle inspection conducted in accordance with
applicable drawings and specifications, to determine compliance with requirements (see 3.2.2). A
borescope examination shall be made of the tube interior surfaces to determine compliance with
requirements. When specified, the tube interior surfaces shall also be magnetic-particle inspected
with a black-light borescope in accordance with applicable drawings and specifications to
determine compliance with requirements. Examine all surfaces of muzzle brakes, bore
evacuators, mortar base plates, etc., by non-destructive inspection (magnetic-particle, liquid
penetrant, radiographic, etc.) in accordance with applicable drawings and specifications to
determine compliance with requirements.
c. Bore and chamber diameters. Bore and chamber diameter measurements shall be in accordance
with the applicable tube QAP and this specification (see 4.5.10). Measurements shall be
recorded. Bore enlargements shall be in accordance with the bore enlargement table of the
pertinent detail specification.
4.7.4 Proof-marking. Proof-tested cannon, mortars, recoilless rifles, muzzle devices and repair cannon
tubes shall be marked near the serial number as proof accepted or adequately tagged as proof rejected by
the proving ground.
4.8 Inspection provisions for packaging. The provisions for inspection of packaging requirements shall
be as prescribed in the applicable individual cannon specification and this specification.
4.8.1 Lot formation. The formation, size and presentation of lots for examination and testing of
cleaning, drying, preservation, packaging, packing and marking shall be in accordance with ASQ Z1.4,
and subject to approval by the Government representative.
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