MIL-C-46274C
Radiographs of the entire production lot shall accompany the ballistic sample to the activity conducting the
production lot acceptance test. Discontinuities in serial numbers shall be identified on the x-ray negative.
Defective cartridges, found by the vendor, shall be clearly identified on the negative and those defectives
removed from the production lot. The serial numbers shall be pen or ink stamped on the cartridge with
approximately 1/8-inch-high characters. The serial numbers shall be located apart from the other cartridge
markings (see 6.2).
4.7.5 Airtightness. Each cartridge shall be subjected to specified pressure differential. The method for
determining airtightness shall be with a helium mass spectrometer. The helium leak rate shall be converted
to standard cubic centimeters of air. Failure to comply with the requirements of 3.5.2 shall be cause for
rejection of the cartridge.
4.7.6 Sealant application. Five cartridges from each production lot shall be selected for this test. Failure
of any cartridge to comply with the drawing requirements shall be cause for rejection of the lot of cartridges.
4.7.7 Vibration test. Twelve of the 21 assembled cartridges of the first article sample, x-rayed as directed
in 4.7.4, properly identified, shall be subjected to vibration. The method and procedures for performing the
vibration test shall be in accordance with MIL-STD-810, Method 514.3, Test Procedure I, Test Condition
I-3.2.5 (see 6.2). Then the 12 vibrated cartridges shall be x-rayed again. Evidence of any disintegration of the
primer, propellant, or igniter, or derangement of any component shall be cause for rejection of the sample.
4.7.8 Functional. The following tests shall be performed by the Government.
4.7.8.1 Primer sensitivity. A quantity of cartridges, in accordance with table I, void of igniter and
propellant, from the first article sample and each subsequent lot shall be tested for sensitivity. In the event
loaded cartridges are selected for test, remove and discard all powder charges from the test cartridge by
sectioning the cartridge case around the periphery. Drop test at 15 inches (adjusted) using a steel ball 1 and
1/2-inch diameter, weighing 7.94 ± 0.02 ounces, in a primer sensitivity machine with a cartridge holder
approved by the acquiring agency. The height of 15 inches shall be adjusted taking into consideration the
actual weight of the ball so that the energy level specified in 3.6.1 is achieved. Failure of the sample to
comply with 3.6.1 shall be cause for rejection of the sample or the lot.
4.7.8.2 Ballistics.
4.7.8.2.1 First article. Twenty-one cartridges of the first article sample shall be grouped and temperature
conditioned as described in table II and 4.8. Following removal from the conditioning chamber, the cartridge
shall be tested as required by 3.6.2.2. Failure of any cartridge to comply with 3.6.2.2 shall be cause for sample
rejection.
4.7.8.2.2 Production lot acceptance. Twenty-one assembled cartridges from each production lot shall
be loaded into acceptable M15 thrusters, divided into three equal groups, temperature conditioned, and fired
in accordance with 3.6.2.2. Failure of any cartridge to comply with 3.6.2.2 shall be cause for rejection of the
lot. In addition to the sample of cartridges for the above test, 10 additional cartridges shall be furnished from
each production lot for investigative purposes.
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