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|  MIL-C-45975B(AR)
4.7.6.1.2 Cannon and spare tubes. Unless otherwise specified by the Procuring
Contracting Officer, cannon and spare tubes shall be sampled for proof firing (see
4.7.6.2.2), in accordance with MIL-STD-1235, using plan CSP-T at an AQL of 1.0.
The appropriate sampling parameters, "i" and "f", shall be designated by the
Procuring Contracting Officer in the contract (see 6.2). Cannon which are or are
not proof fired as a result of the sampling procedure shall have had their breech
mechanisms simulation tested and accepted (see 4.7.6.2.1).
4.7.6.1.3 Successive production buys. Successive production buys shall not
require "i" quantities. However, a new "i" quantity shall be used if any of the
following conditions apply:
a. The time lapse between two successive buys from the same contractor is
one year-or more.
b. A new contractor is utilized.
c. Significant change is made in a manufacturing process or material.
d. A design change is made.
4.7.6.1.4 Weapon record data. Each cannon and spare tube shall be furnished with
applicable data on DA Form 2408-4 (Weapon Record Data), as specified by the
Procuring Contracting Officer.
4.7.6.2 Proof acceptance test methods.
4.7.6.2.1 Breech mechanisms. Breech mechanisms shall be simulation tested at a
Government specified weapon test facility in accordance with the following
procedure:
a. The breech mechanism shall be tested once by means of hydraulic pressure
testing equipment at a pressure of 59,000 + 2,300 psi. Test pressure
shall be immediately released upon its attainment. The pressure-time
graph shall be subject to approval by the Procuring Contracting Officer.
(1) When difficulty is encountered in attaining test pressure, the
number of attempts in which over 10 percent of the test pressure is
attained, shall not exceed five.
(2) If the cause of difficulty cannot be identified and corrected within
five pressure cycles, the breech mechanism shall be subjected to
proof firing as part of the cannon (see 4.7.6.2.2). This fact shall
be noted on inspection records identifiable with the specific breech
mechanism.
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