DOD-P-63975 (AR)
4.5.6 Action time. The test rounds, assembled in accordance
with Drawing 11825947, shall be conditioned at -54°C, 21°C
and 71°C and fired from a test fixture barrel in accordance with
Drawing 11825969. The time between application of voltage to
primer and exit of the projectile from the muzzle shall be
measured. The time shall comply with the requirement of 3.10.
Any corrected action time of 2.40 milliseconds or less shall be
regarded as an instrumentation error.
4.5.7 Function and casualty. The method of test shall be as
specified in AMCR 715-505, Volume 8. The test sample primers
shall be inserted into cases that have been previously inspected
for depth and diameter of primer pocket and length to shoulder
basic diameter. The sample primed cases shall be assembled as
Cartridge, 30mm, Target Practice, conforming to Drawing 11825947.
Prior to firing, the test cartridges shall be inspected for depth
of primer seating, primer crimp missing, loose primer, metal
slivers on case head or primer, profile and alignment max., and
presence of foreign matter on the primer button. The sample test
cartridges shall be fired in bursts of 25 rounds (21°C),
-54°C, and 71°C at a cyclic rate of the ADEN automatic gun, or
the XM230E1 autogun as required in the contract or purcahse
order. The gun barrel shall be at ambient temperature at the
beginning of each burst. Two hundred cartridges shall be fired at
21°C, and 100 cartridges at each -54°C and 71°C.
4.5.8 Misfires. Test cartridge(s) which fail to fire using
the specified equipment shall be classified as to the cause of the
failure where applicable and recorded as misfire(s) in accordance
with Table II.
4.5.9 Environmental tests. Unless otherwise specifed,
performance during and/or after environmental exposure, as
specified in the applicable test procedure shall consist of
conducting the test of 4.5.6 except all test rounds shall be
conditioned at 21° C prior to firing.
4.5.9.1 Temperature, humidity, and altitude.
The test
cartridge shall be subjected to the temperature/humidity/altitude
test of MIL-STD-810, method 518. After exposure, the test item
shall be examined for deterioration and subjected to the test
referenced in 4.5.6.
4.5.9.2 Aircraft vibration. The test cartridge(s) shall be
subjected to a broad band random vibration profile in accordance
with the requirements of MIL-STD-810, Method 514.2, Procedure IIb,
except the vibration spectrum shall be as shown in Figure 1. The
test item shall be mounted to a test fixture simulating a AAH
magazine in a normal airplane mounting specified by the procuring
agency. The test duration shall be 45 minutes in each of three
mutually perpendicular axs at each of two temperature conditions,
-40° + 2.8°C and 65.5° + 2.8°C. Following exposure, all of
the test items shall be subjected to the tests referenced in 4.5.6.
17
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business