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Breech mechanism simula tion proof test |
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|  MIL-C-45978A(AR)
e.
Cannon shall be borescoped (see 4.7.7.1.7.1) and magnetic
particle inspected (see 4.7.7.1.7.2).
f.
Cannon found to be defective at the proving ground, as a
result of a critical failure, shall be reported to the
Product Assurance Directorate, Watervliet Arsenal,
Watervliet, NY 12189 and Benet Laboratories, Watervliet
Arsenal, Watervliet, NY 12189 within one working day. The
test agency shall forward an Equipment Performance Report
(EPR), incident to the deficiency within three working
days.
All cannon
4.7.7.3.2 Breech mechanism simula tion proof te st
q
q
not proof fired at a proving ground shall have the breech
mechanism tested in accordance with the following procedure:
a.
Each breech mechanism shall be tested by means of a
suitable hydrostatic pressure testing equipment for one
application of an internal overpressure (proof pressure) of
55,000 + 2,000 psi. Proof pressure shall be immediately
released upon attainment. Cycle time to achieve proof
pressure and release shall not exceed one minute.
When difficulty is encountered in attaining the test
(1)
pressure the number of attempts in which 10 percent or
less of the test pressure is attained shall not be
counted. However, 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 is not identified and
corrected within five pressure cycles, the breech
mechanism, as part of the cannon, shall be proof fired
in accordance with 4.7.7.3.1.
The peak pressure shall be recorded for each test
(3)
.
pressure cycle and attached to the inspection records
for the particular breech mechanism undergoing test.
b.
After pressure testing, each mechanism shall be examined
for looseness or interference of fit or function.
c.
The breech mechanism shall be disassembled and examined for
material soundness by magnetic particle inspection,
conducted in accordance with specifications, procedures,
and acceptance criteria as specified on applicable
drawings.
5.
PACKAGING
12
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