MIL-DTL-60315C (AR)
4.4 Methods of inspection.
4.4.1 Increment loading assembly weight. The increment shall be weighed and check
weighed 100 percent. Any increment which fails to comply with the requirements shall be
classed defective and removed from the lot. Inspection equipment will be in accordance with
4.4.5.
4.4.1.1 Method 1. The propellant shall be weighed in a container and placed in the
bag, the bag sewn and the increment loading assembly weighed. The net weight of propellant
may be calculated using an average tare weight of the empty bags or the actual tare weight as
marked on the individual bag.
4.4.1.2 Method 2. The propellant in a container shall be weighed and then check
weighed on a different balance and shall then be placed in the bag and the bag sewn. The weight
of the loaded bags should be checked as a major defect in accordance with MIL-STD-1916. The
net weight of the propellant shall be calculated using an average weight of the empty bag or the
actual tare weight as marked on the individual bag.
4.4.2 Container gasket inspection. Container lids will be inspected 100% for cut, dried-
out, cracked, abraded or improperly affixed gaskets or excessive adhesive used in affixing
gaskets. If any gasket is found with any of the conditions listed above, the lid shall be classed
defective and removed from the lot.
4.4.3 Container air pressure test. All containers (100%) shall be subjected to an internal
pressure test of 2.0 - 0.5 pounds per square inch (psi) by an approved method, (see 6.4). A gage
(designed to read ¼ psi) or a water manometer shall be assembled in the system. A container
experiencing a drop of ¼ psi on the gage or 0.7 inches on the manometer in 15 seconds shall be
classed defective and removed from the lot.
4.4.4 Proving ground assessments. These tests shall be conducted at a government
proving ground in accordance with the appropriate acceptance test procedure (ATP) using inert
M1 projectile (33.00 +/- 0.02 pounds) and fired from an M101A1 Howitzer with a M2A2
Cannon with 75 percent minimum remaining life. Prior to firing, all charges shall be
temperature conditioned for a minimum of 24 hours and shall be fired within five minutes after
removal from the conditioning chamber. A tolerance of -5 Fahrenheit degrees applies to all -
50°F and +145°F requirements and a tolerance of plus or minus 2 Fahrenheit degrees applies to
all 70°F requirements. Calibration charges shall be fired alternatively with the test samples and
the muzzle velocity and pressure of all charges shall be corrected to standard condition.
4.4.4.1 Muzzle velocity and muzzle velocity standard deviation. If the average velocity
at 70 degrees F is below the minimum velocity of 1500 fps (457.2 m/sec) or exceeds the
maximum velocity of 1550 fps (472.4 m/sec) at Zone 7, the lot shall be rejected. If the velocity
standard deviation of the samples exceeds 8 fps (2.4 m/sec), the lot shall be rejected.
4.4.4.2
Chamber pressure.
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