MIL-DTL-82724A
4.6.2 Ignition element assembly. After visual, radiographic and leakage inspections, the ignition
element assemblies shall undergo the tests listed below in the sequence given. The ignition elements,
installed in modified cartridge cases, shall be conditioned at 70° ± 5° F for a minimum of 4 hours prior to
testing.
4.6.2.1 Power-current test. Each ignition element in the first article test sample shall have a direct
current of not less than one ampere supplying a minimum of one watt applied to the bridge circuit for a
period of at least 5 minutes. The test current shall be regulated throughout the period of application to
within 2 percent. If a rectified current is used, the ripple content shall not exceed 5 percent rms of the test
current. Test temperature is ambient and the sample or lot is rejected if a cartridge fires during the 5
minute period.
4.6.2.2 Ballistic test. After conditioning, the sample shall be installed into the ignition element test
chamber (DL 838AS123). The sample shall be fired by application of 4.0 ± 0.1 amp and shall meet the
requirements of 3.3.2.
4.6.3 Cartridge assembly.
4.6.3.1 Visual inspection. Examine all cartridges visually and reject those having any of the defects of
3.4.1.
4.6.3.2 Bridge circuit resistance. Conformance with the bridge circuit resistance of 3.4.2 shall be
ascertained on all completely assembled cartridges by means of a test circuit which limits the bridge
circuit current to 25 milliamperes, maximum. A safety chamber shall be used to protect the operator
during the application of current. A suitable instrument which is known to be accurate within one percent
in the range of resistance specified shall be used to determine whether or not the requirement is being
met. Units which fail to meet the requirements of 3.4.2 shall be rejected. The results of bridge circuit
resistance measurements shall not be affected by the resistance of the test circuit and connector.
4.6.3.3 Leakage. Each assembled cartridge in the sample represented shall be leak tested in a dry gas or
dry air leak tester. Cartridges which exhibit a leak rate in excess of 10-4 cc/sec of air or gas at a pressure
differential of 0.5 ± 0.05 atmosphere shall be considered defective. The sample shall be accepted if the
requirement of 3.4.3 has been met at ANSI/ASQC Z1.4 inspection Level I.
4.6.3.4 Radiographic examination. All cartridges in the first article or production test samples shall be
radiographically examined in accordance with ASTM E1742; any observable imperfections in the
assembly shall be cause for cartridge rejection. 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
cartridge 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
identification shall include the complete lot number, as stamped on the cartridges, and the span of serial
numbers displayed. If any assembly or loading defects are noted then the contractor must 100 percent X-
ray the represented lot and submit X-rays to the cartridge design activity for review (see 6.2.2).
Discontinuities in serial numbers shall be identified on the X-ray. Defective cartridges found by the
vendor shall be clearly identified on the X-ray and those defectives removed from the production lot. The
serial numbers shall be pen or ink stamped on the cartridges with approximately 1/8 inch-high characters.
The serial numbers shall be located apart from the other cartridge markings. When screening of the
production lot by X-ray review is required, it shall be at the expense of the contractor.
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