DOD-C-63980(AR)
3.8 Case mouth pressure.
The mean peak pressure shall not
0
0
The mean peak pressure shall
exceed 270-310 MPa at 21 C ±5 C .
not exceed 415 MPa at temperatures of -540C and 710C
respectively. Following environmental exposure, the mean peak
pressure shall not increase or decrease from the mean peak
pressure at 21 ±5°C by more than 60 MPa
3.9 Environmental conditions. The cartridge shall not be
damaged, deteriorated, or performance degraded beyond the limits
of this specification after exposure to the following
environmental
conditions.
3.9.1 Temperature, humidity and altitude. Temperature/
humidity/altitude cycling conditions in accordance with
MIL-STD-810, method 504, with the temperature ranging from -540C
to 650C , relative humidity up to 95 percent, and pressure
conditions equivalent to 15.2 kilometers altitude.
3.9.2 Salt fog. Exposureto
salt
c
sea
atmosphere
specified
in
MIL-STD-331, Method 107.
Vibration as specified in
3.9.3
Aircraft
vibration.
MIL-STD-81O, Method 5: 4 except as modified in Section 4.
Immersion
for
one
hour
in
water
under
3.9.4 Waterproofness.
a pressure of 0.1 MPa ± 10% 210C.
The cartridge when fired in a single shot
3.1O Accuracy.
test barrel (Dwg 11825969} shall be such that the standard
deviation of the impact points about the mean impact point shall
not exceed 1.35 mil.
The mean action time plus 3 standard
3.11 Action time.
deviations shall not exceed 4.0 milliseconds (ms) at -540C ,
21°C and 710C. The maximum individual action time shall not
exceed 4.0 ms at -540C 2 10C and 710C. The action time is
defined as the time period between the application of electric
current to the primer and the exiting of the projectile from the
muzzle.
3.12 Function and casualty. The cartridge shall function as
required and there shall be no separation or breakup of cartridge
parts during the firing sequence. When fired in the automatic gun
See
there shall be no gun stoppages caused by the ammunition.
6.13.
4
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