MIL-C-81861(AS)
those adjustments will be permitted which can be made by using such controls and
adjustments that are accessible to the operator during the normal use of the
equipment. This test shall be deleted if the reliability test includes a test on
each equipment which consumes at least 6 hours of operation.
Room ambient
Temperature
Room ambient
Humidity
Any selected frequency
Vibration
within the range of 20
to 30 cps (excluding
resonant points) and a
minimum amplitude of ± 3g's
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 imperfect workmanship. Operation within the specified limits of
satisfactory performance is not necessarily required during the vibration period.
The direction of vibration should be vertical 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 two 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 operation.
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. This test is not required if
a Reliability Assurance Test is selected which includes a test on each equipment
which consumes at least 6 hours of operation.
Sampling Tests. Equipments selected for sampling tests shall first
4.4.2
have passed the individual tests. Equipments shall be selected for sampling tests
by the Government Inspector in accordance with the following:
Quantity to deselected
Quantity of Equipments
for Sampling Test
Offered for Acceptance
0 (See Note)
First 10
1
Next 50
1
Next 75
1
Next 100
1 for each additional 200
or fraction thereof
Sampling Tests are not required when Reliability Assurance Tests are conducted.
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