MIL-PRF-49078A(CR)
3.4 Ownership and support requirements. Each handset shall possess the following life cycle
ownership characteristics.
3.4.1 Reliability. Perform at least 2,000,000 transmit/receive operations without failure.
3.4.2 Safety. The handset mechanical components shall be free of hazardous burrs, nicks, sharp
edges, foreign materials, or other imperfections posing physical danger to operators. Handset
electrical components shall be free from exposed, frayed, unsecured, or otherwise improperly
protected circuits posing electrical danger to operators.
3.5 Operating environment requirements. Each handset shall operate under the following
environmental conditions without damage or loss of performance: (All temperatures have a
tolerance of plus and minus 5l F).
3.5.1 Low temperature. The handset shall show no more than 3 dB change in response from its
original measurement when operating at the temperature of -40l F after being stored at
temperature of -67l F for 4 hours. Handsets subjected to this requirement shall not be delivered
on the contract.
3.5.2 High temperature. The handset shall show no more than 3 dB change in response from its
original measurement when operating at the temperature of 149l F after being stored at
temperature of 158oF for 2 hours. Handsets subjected to this requirement shall not be delivered on
the contract.
3.5.3 Humidity. Subject handset to natural cyclic high humidity conditions under randomly
varied temperatures between 790F and 950F with the relative humidity randomly varied between
79 and 100 % over a 24 hour period. Stabilize the test article at ambient conditions for another
24 hours. Subsequent to humidity response, the handset shall perform as described in paragraph
3.2.1 a & e. Handsets subjected to this requirement shall not be delivered on the contract.
3.5.4 Altitude. The handset shall be capable of being stored at 50,000 feet for 1 hour and then
subjected to an altitude of 10,000 for two hours. Following storage, the handset shall perform as
described in paragraph 3.2.1 a & e.
3.5.5 Leakage. The handset shall be capable of being immersed into three feet of water for at
least two hours. The handset should be removed, dried and meet requirements in accordance with
3.2.1 a & e within 24 hours. Handsets subjected to this requirement shall not be delivered on the
contract.
3.5.6 Blast. The handset shall meet the requirements of 3.2.1 a & e with no more than a 3 dB
change in response from its original measurement when subjected to 30 blast impulses at a peak
pressure of 9.5 pounds per square inch. Handsets subjected to this requirement shall not be
delivered on the contract.
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