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|  MIL-F-21572(Wep)
(4) Where practical, include a test in the individual test to check all equip-
merit for this requirement until reasonable assurance is obtained that
the defect has been satisfactorily corrected.
4.5
Life Test -A 300-hour test shall be conducted at the contractor's pkntonw
early equipment representative of the current production The life test shall be performed under
the conditions specified in 4.5.1. The, life test sample shall be selected by the government in-
spector in accordance -with the following. When a production sample equipment is submitted to
the procuring activity for test then the first equipment specified below need not be selected or
subjected to this test. (Equipments which have successfully passed the sampling tests or special
tests may be selected for life tests. )
Quantity
Quantity of Equipments
to be Tested
Offered for Acceptance
1
First 25
1
Next 175
1
Next 300
1 for each additional 500
or fraction thereof
4.5.1 Test Conditions - The life test shall be conducted under the following simulated
service conditions.
Normal room
Temperature
Normal ground (O -5000 ft. )
Altitude
Humidity
115 5 volts (at lowest applicable
A. C. voltage
.
frequency)
27.0 2.0 volts
D. C. voltage
4 . 5 . 2 Test Periods - The test may be run continuously or intermittently. Any period of
operation shall be of sufficient duration to permit the equipment temperature to stabilize. Period-
ically, the equipment shall be turned on and off several times and put through its various phases
of operation.
4.5.3 Performance Check -At approximately 8-hour intervals during the test, a limited
performance check shall b e made. The performance check proposed by the contractor shall be
subject to approval by the procuring activity.
4. 5.4 Test Data - The contractor shall keep a daily record of the performance of the
equipment, making particular note of any deficiencies or failures. In the event of part faiIures,
the defective part shall be replaced and the operation resumed for the balance of the test period.
A record shall be kept of all failures throughout the test, including all tube failures. This record
shall indicate the following:
(1) Part type number
(2) The circuit reference symbol number
(3) The part function
(4) Name of the manufacturer
(5) Nature of the failure
(6) The number .of hours which the part operated prior to failure
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