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MIL-A-81371(AS)
Equipment Failure - Should a failure occur during either the sampling,
4.4.5
reliability assurance or special tests, the following action shall be taken
(1) Determine the cause of failure.
(2) Determine if the failure is an isolated case or design defect.
(3) Submit to the procuring activity for approval, proposed corrective- .
action intended to reduce the possibility of the same failure(s)
occuring in future tests.
(4) Where practical, include a test in the individual test to check all
equipment for this requirement until reasonable assurance is obtained
that the defect has been satisfactorily corrected.
Life Test - The contractor shall furnish all samples and shall be respon-
4.5
sible for accomplishing the life test. The test shall be of 300 hours duration and shall be
conducted on equipments that have passed the individual test. The life test shall be perform-
ed under the conditions specified in 4.5. 1* The life test sample shall be selected by the
government inspector in accordance with the following. (Equipments which have success-
fully passed the initial production test, sampling tests, reliability tests Or sPecial tests
may be selected for life tests. ) When reliability tests are conducted, the life test may be
omitted if, during the reliability tests, a quantity of equipments equal to, or more than,
that listed below receive at least 300 hours each of test time.
Quantity to Be Selected
Quantity of Equipments
for Life Test
Offered for Acceptance
1
First 25
1
Next 175
1
Next 300
1 for each additional
500 or fraction thereof .
Test Conditions - The life test shall be conducted under the following
4.5.1
simulated service conditions:
Temperature
Normal room
Altitude
Normal ground (O -5000 ft)
Humidity
Room ambient
AC voltage
115 +6 volts (at lowest applicable frequency)
DC voltage
27.0 +2. O volts
Test Periods - The test may be run continuously or intermittently.
4.5.2
Any period of operation shall be of sufficient duration to permit the equipment temperature
11

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