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Propellant charge weight uniformity |
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|  MIL-C-48654(AR)
to the responsible technical activity. Individual chamber
pressures shall be obtained for each round firing.
4.5.5.1 Refiring. If for any reason the proving ground
considers that conditions have detrimentally affected the test
results, additional cartridges as required shall be tested.
4.5.6 Propellant charge weight uniformity. (To be conducted
at a U.S. Government Proving Ground). Ten test ignition
cartridges shall be loaded at charge weight with a tolerance of
plus or minus 0.5 grains. The ignition cartridges shall be
assembled to 60MM production rounds. Rounds shall be inert loaded
to achieve a total weight of 3.75 pounds plus or minus .02
pounds. The rounds shall be conditioned at 70F (+2.5F) for
24 hours prior to firing and shall be maintained at this
temperature until fired. The rounds shall be fired from a 60MM
LWCMS ballistic tube at an elevation of forty-five degrees.
Calibration rounds shall be fired alternately for velocity
correction. The mean corrected velocities of the group shall be
compared to the established charge weight velocity. If the
corrected velocity of the test rounds exceeds two percent of the
expected muzzle velocity, use of the propellant lot shall be
referred. Test results shall be forwarded to the technical agency
for evaluation (Commander, US Army Armament Research and
Development Center, ATTN: SMCAR-AEE-BP, AMSMC-QAR-R, AMSMC-QAT-B,
Dover, NJ 07801-5001).
4.5.7 Static pressure test. The ignition cartridges shall be
threaded into the M27 Fin and firmly seated. A 3/32 inch hole
shall be drilled in the ignition cartridge tube through one flash
hole in the seventh row of flash holes in the fin boom, counting
from the ignition cartridge end. A pressure transducer, mounted
to a collar (see SKETCH 1), shall be attached to the fin boom,
positioning the collar so that the transducer will be directly
over the flash hole drilled in the ignition cartridge tube. The
collar shall be positioned carefully to prevent restriction of
venting from other flash holes in the boom. The assembly shall be
set up as shown in SKETCH 2 and the transducer connected to a
recorder. The ignition cartridge shall then be functioned and
pressure/time tracer recorded.
PACKAGING
5.
5.1 Packaging, packing and marking. Packaging, packing and
marking shall be as specified in Dwg 9287826.
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