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|  MIL-I-21400(Aer)
(2) Vibration Test (90 minutes cycling - in each of 3 planes)
(3) Humidity Tests
Equi- ment Failure - Should a failure occur during either the sampling or
4.3.4
p
.
special tests, the following action shall be taken:
".
-
(l)" Determine the cause of failure. "
(2) Determine if the failure is an isolated case or design defect.
(3) Submit to the Bureau of Aeronautics for approval, proposed
corrective action intended to reduce the possibility of the same
failure(s) occurring 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.
`4.4
Life Test - A 300-hour life test shall be conducted at the contractor's
plant on an early equipment representative of the current production. The life tests shall be
performed under the conditions specified in 4.4.1. The life test sample shall be selected by
the Government Inspector in accordance with the following:, (Equipments which have success-
fully 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
26 to 200
1
201 to 500
Over 500
1 for each additional
500 or fraction thereof
Test Conditions - The life test shall be conducted under the following
4.4.1
simulated service conditions:
Normal room temperature
Temperature
-
Normal room
Altitude
Room ambient
Humidity
26.5 + 2.5 volts
D. C. Voltage
Test Periods - The test may be run continuously or intermittently. Any
4.4.2
period of operation shall be of sufficient duration to permit the equipment temperature to stabilize.
Periodically, the equipment shall be turned on and off several times and put through its various
phases of operation.
Performance Check - At approximately 8-hour intervals during the test,
4..4.3
a limited performance check shall be made. The performance check proposed. by the contractor
.
shall be subject to approval by the Bureau of Aeronautics.
.'
4,4.4
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 failures,
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
11
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