MIL-DTL-50647B
misplaced or deformed inert parts; anvil abnormally close to the ignition device cup dome; and all other
observable defects in assembly.
4.7.2 Hardness. Ten units from each heat-treated lot of components shall be tested with a hardness
tester. Failure of a unit to comply with the requirements of the drawings shall be cause for rejection of
the lot of components.
4.7.3 Protective finish. Unless otherwise specified (see 6.2 and 6.4), sampling plans and procedures in
the determination of acceptability of coated parts shall be in accordance with the provisions set forth in
MIL-A-8625.
4.7.4 Radiographic examination. All assembled cartridges shall be radiographically examined in
accordance with ASTM E1742. 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 radiograph 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 contractor, 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 Leak test. Each cartridge shall be subjected to specified pressure differential. The method for
determining leakage 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 for first article inspection shall be disassembled in such a
manner that determination can be made that the sealant has been properly applied for the full length of the
joining surfaces at the junction of the sealing disc and case sidewall and that the propellant cavity is free
of sealant.
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 ignition device, 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 Ignition device sensitivity. A quantity of cartridges, in accordance with table II, void of delay
charge igniter and propellant, from the first article sample and each subsequent lot shall be tested for
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