MIL-DTL-46618C (OS)
4.7 Test methods and procedures.
4.7.1 Ignition Device x-ray. Prior to assembly into the cartridge, the Ignition Device shall be
radiographically examined in accordance with ASTM E 1742/E 1742M. Each Ignition Device shall be x-
rayed on boards or trays with the cup side perpendicular to the rays. The x-ray negatives shall be
identified by item nomenclature and by lot number. Ignition Devices are to be left mounted to the boards
or trays until after the x-rays have been reviewed and defects identified to facilitate removal of defective
units. After screening, the x-ray negatives with defectives identified, shall be forwarded to the
engineering activity designated by the acquiring activity (see 6.2). Interpretation of the radiographic films
shall verify the following:
Presence of Ignition Device 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. Sampling plans and procedures in the determination of acceptability of coated
parts shall be in accordance with the contract and MIL-A-8625 (see 6.2).
4.7.4 Radiographic examination. All assembled cartridges shall be radiographically examined in
accordance with ASTM E 1742/E 1742M. 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 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 inches air. Failure to comply with the requirements of 3.3.2 shall be cause for
rejection of the cartridge.
4.7.6 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 1-3.2.5 (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.
4.7.7 Functional. The following tests shall be performed by the Government.
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