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|  MIL-F-21572(Wep)
(3) Special Tests
4.4.1 Individual Tests - Each equipment submitted for acceptance shall be sub-
jetted to the individual tests. These tests shall, be adequate to determine compliance with
the requirements of material$ workmanship, operational adequacy and reliability. As a
minimum, each equipment accepted shall have passed the following tests:
(1)
Examination of Product
(2)
Operational Test
(3)
Manufacturing Reliability Test
4.4. 1.1 Examination of Product - Each equinment shall be examined carefullv to
determine that the material and workmanship requirements have been met.
4. 4. 1. 2 Operational Test - Each equipment shall be operated long enough to permit
the equipment temperature to stabilize and to check sufficient characteristics and record ade-
quate data to assure satisfactory equipment operation. .
4.4.1.3 Manufacturing Reliability Test - Each equipment shall be operated under the
conditions specified herein for a period of 6 h ours without failure. A failure shall be defined
as anything which causes malfunctioning of the equipment. Only 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.
Ambient room
Temperature
Humidity
Ambient room
Any selected frequency within the range
Vibration (10 minutes)
.
of 20 to 30 cps (excluding resonant points)
and a minimum amplitude of 3 g'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 work-
manship. 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 that 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 operation. Should a fail-
ure occur, it should be repaired and the test started over, except that the 10-minute vibra-
tion 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.
4.4.2- Sampling tests shall be conducted OR equiptments which have
successfully. passed the individual tests. The following equipments shall be selected by the
Government Inspector for sampling tests:
Quantity
Quantity of Equipments
to be Tested
Offered for Acceptance
1
First 10
1
Next 50
Next 75
1
1
Next 100
10
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