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| MIL-C-46239C
identified, shall be forwarded to the engineering activity designated by the acquiring activity. Interpretation
of the radiographic films shall verify the following:
Presence of Primer Charge
No Material Defects
4.7.2 Hardness. Ten units from each heat-treated lot of components shall be tested with a hardness tester.
Failure of any unit to comply with the requirements of the drawings shall be cause for rejection of the lot of
components.
4.7.3 Protective finish. Procedures for the determination of acceptability of coated parts shall be in
accordance with the contract and MIL-C-60539.
4.7.4 Radiographic examination. All assembled cartridges shall be radiographically examined in
accordance with MIL-STD-453. The cartridges shall be positioned on their sides for the most revealing
exposure. All cartridges shall be identified with serial numbers prior to examination. The serial numbers shall
be in consecutive order beginning with the number 001 in each production lot. The cartridges shall be arranged
on trays or boards in consecutive numerical order, and each radiograph shall carry a permanent identification
of the cartridges displayed thereon. The radiographic plate identification shall include item nomenclature, the
complete lot number as stamped on the cartridges, the span of serial numbers displayed, and the contract
number. Cartridges having any observable imperfections in assembly shall be cause for rejection.
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 II, void of igniter and
propellant, from the first article sample and each subsequent lot shall be tested for sensitivity. In the event
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