MIL-PRF-49384B(CR)
4.7 Reliability.
4.7.1 First article reliability. The lower test MTBF (θ1) shall be demonstrated in
accordance with the following subparagraphs.
4.7.1.1 Test level.
Test +50°C, (+5 - 0)°C
Temperature cycling - None
Vibration - 2.2 g's, ±10 percent peak acceleration value at any nonresonant frequency
between 20 and 60 Hz measured at the mounting points of the equipment. The duration
of vibration shall be at least 10 minutes during each hour of equipment operating time.
The vibration shall be perpendicular to the plane of the printed circuit board.
Equipment on-off cycling - Turn on and let temperature stabilize, hold for 3 hours, then
turn off and let temperature stabilize. This cycle shall continue throughout the test.
4.7.1.2 Parameters. The discrimination ratio θo/θ1 shall be 3.
4.7.1.3 Failure criteria and test length. The tests of table III shall be performed at least
once prior to and once after the tests of 4.7.1.1. Additional testing of table III may be selected by
the contractor. The results of all table III tests and any physical damage shall be used to
determine the success or failure of the reliability test. In the event of a Table III test failure, the
time interval between the preceding successful test and the failure shall not contribute to the total
cumulative hours. Testing shall continue until the total unit hours, together with the total count
of relevant equipment failures, permit either an accept or reject decision. Only equipment "ON"
time shall contribute to the total unit hours. No single equipment's "ON" time shall be less than
one-half the average operating time of all equipment on test.
5. PACKAGING
5.1 Packaging and Marking. For acquisition purposes, the packaging and marking
requirements shall be as specified in the contract or order (see 6.2). When actual packaging of
materiel is to be performed by DoD personnel, these personnel need to contact the responsible
packaging activity to ascertain requisite packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activity within the Military Department or
Defense Agency, or within the Military Department's System Command. Packaging data
retrieval is available from the managing Military Department's or Defense Agency's automated
packaging files, CD-ROM products, or by contacting the responsible packaging activity.
Disposal methods per MIL-HDBK-742 is cited for guidance.
6. NOTES
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