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MIL-A-81371(AS]
The equipment shall be vibrated (without vibration isolators) for a period of 10 minutes
prior to the beginning of the 6-hour period of operation. Where feasible, the equipment
shall be operated during this vibration period for the purpose of detecting flaws and imper-
fect workmanship. Operation within the specified limits of satisfactory performance is not
necessarily required during the vibration period. The direction of vibration should be verti-
cal to the normal mounting plane for 5 minutes and lateral to the plane for 5 minutes.
Where it is not feasible to vibrate the equipment in 2 directions the vertical direction shall
be used, During the 6-hour period of operation following the 10-minute vibration period,
the equipment shall be mechanically cycled periodically through its various phases of oper-
ation. Should a failure occur, it should be repaired and the test started over, except that
the 10-minute vibration period need not be repeated when it is certain the failure was not a
result of the vibration. Should repetitive failures occur, corrective action shall be taken
to eliminate this" defect from future equipment. A record shall be kept of all failures. The
6-hour period specified above may be composed of two 3-hour periods to conform with
standard working hours.
Sampling Tests - Equipments selected for sampling tests shall first have
4.4.2
passed the individual tests. Equipments shall be selected for sampling tests by the govern-
ment inspector in accordance with the following (Sampling tests shall not be conducted
unless reliability assurance tests of 4.4.3 are deleted by contractual action. )
Quantity to Be Selected
Quantity of Equipments
for Sampling Test
Offered for Acceptance
0*
First
10
1
Next
50
1
Next
75
1
Next
100
1 for each additional
200 or fraction thereof
*NOTE  :
If by contract action the initial production test (4.3) is deleted, then a
sample test shall be conducted on one equipment from the first 10 produced.
Scope of Tests - As a minimum each equipment selected for sampling
4.4.2.1
tests shall be subjected to the following tests:
(1) Complete operational test at ambient room conditions, making all
necessary measurements to assure that all applicable specification
requirements have been met.
(2) Operational test at certain environmental conditions. The conditions
may vary for each equipment tested and should be based on results,
of the preproduction, initial production, individual and special tests.
(3) Manufacturing run in test specified in 4.4.1.3 except that the test dura-
tion shall be 120 hours with no restriction on the number of failures.
However, each failure shall be analyzed as to cause and remedial action
necessary to reduce the possibility of its recurrence in future equipment.
9

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