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|  MIL-M-45013E (AR)
4.5.9.3 Barrel life.
4.5.9.3.1 At the start of test and during the last 30 rounds
of each of the final 200-round complements for each barrel in
each 10,000-round gun cycle; cyclic rate shall be measured; and
accuracy, projectile velocity, and evidence of yaw or keyholding
determined. Results shall be compared with the criteria in
3.4.9.3.
For informational purposes, the cyclic rate of fire shall
a.
also be recorded over a 20-round burst. Cyclic rate
instrumentation shall be the same as for function firing.
The accuracy, and projectile velocity and yow of each
barrel shall be measured from the firing of a 10-round
burst. Targets shall be placed at a range of 100 yards.
Projectile velocities shall be measured and recorded
instrumentally at a point 9 yards forward of the muzzle.
The yaw or keyholding shall be determined from the 10-
round burst. Firing schedules No. 1 and No. 2 do not
apply during these 30-round periods.
If a barrel is declared unserviceable, the rounds fired
b.
on the barrel shall be recorded and the barrel replaced
with a new barrel. When a barrel is suspected of bing
unserviceable during cycles, a check of 10 projectile
velocities and yaw shall be made.
After measure of accuracy, projectile velocity, cyclic
c.
rate and yaw, all subsequent firing is per schedule No. 1
and No. 2 until the initial 200-round complement on the
assigned barrel is complete. The assigned barrel is then
replaced with the spare barrel and the above repeated.
During the final 30 rounds of the last 200-round
d.
complement, for each barrel in each 10,000-round gun
cycle; cyclic rate, accuracy, velocity, and yaw
measurements shall be recorded. The initial 20 rounds of
the last 30 rounds of the complement are fired in one
burst and the cyclic rate recorded. The remaining 10
rounds are fired in one 10-round burst and accuracy,
projectile velocity and yaw determined.
4.5.10 Packaging tests. The level A sample unit packages
shall be tested in accordance with the requirements of MIL-P-116.
4.5.11 Load test of front mounting pin. The test shall be
performed using standard measuring and test equipment.
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