MIL-DTL-13931J
b. Automatic cannon. Before engineering tests and firings, manual operation of automatic cannon,
using dummy rounds, to insure proper functioning and non-existence of broken or damaged parts.
c. Breech mechanism. Functioning check of breech and firing mechanisms.
d. Interior surfaces. Borescope examination of the interior surfaces of cannon tubes for defects. If
the proving ground inspection of the first 10 consecutive cannon tubes agrees with the
examination taken at the manufacturing facility of the particular contractor, sampling inspection
of cannon tubes subjected to borescope examination may be conducted at a frequency of one tube
out of 25 cannon tubes thereafter. Sampling shall insure that continuing quality is being
maintained (see 4.3.3).
e. Bore and chamber measurements. 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. If the measurements obtained during proving ground inspection of the first
10 consecutive cannon tubes agree with the measurements taken at the manufacturing facility of
the particular contractor, sampling inspection of bore measurements before firing may be made at
a frequency of one tube out of 25 cannon tubes thereafter. Sampling shall insure that continuing
quality is being maintained (see 4.3.3).
4.7.2 Proof-firing tests. Proof-firing, simulation tests, or both shall be conducted as specified in the
detail specification or as directed on all critical components defined by the design agency. Unless
otherwise specified, proof-firing tests shall be performed by the Government. When proof-firing tests are
specified for components that are furnished separately, the tests shall be made by firing the specified
rounds in an appropriate weapon with the component assembled. When practical, such tests shall be
combined with proof-firing tests for cannon or repair tubes. A proof facility cannon may be used at the
option of the Government.
4.7.2.1 Proof-firing schedule. A proof-firing test shall consist of firing the number of standard and
specific-pressure rounds in the order and manner specified in the applicable detail specification. It shall
include any additional rounds needed to clarify any indecisive results.
4.7.2.2 Proof ammunition. The standard weight of projectile, the muzzle velocity and the upper
pressure limit at 70 degrees F + 3 degrees F shall be as specified on the applicable ballistic drawing or in
the pertinent detail specification. Standard and specific pressure ammunition used in the proof-firing
shall conform to the following:
a.
Standard-pressure round. A standard-pressure round shall use a standard weight projectile,
shall be loaded with the weight of propellant established at the time of assessment of the
propellant lot, and shall produce the specified muzzle velocity. The resultant pressure shall be
within the limits of the upper pressure limit at 70 degrees F + 3 degrees F and the lower
acceptable mean pressure. If the specified muzzle velocity is not reached with the maximum
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