workmanship. Operation within the specified limits of satisfactory performance is not nec-
essarily 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 2 directions the vertical direction shall be used.
During the 6-hour period of operation following the 10-minute vibration period, the equip-
ment 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.
Sampling Tests - Equipments selected for sampling tests shall first have
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 of Equipments
Quantity to Be Selected
for Sampling Test
Offered for Acceptance
1 for each additional
200 or fraction thereof
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
tests shall be subjected to the following tests:
(1) Complete operational test at ambient room conditions, making all
necessary measurement to assure that all applicable specification
requirement 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 18.104.22.168 except that the test dura-
tion shall be 120 hours with no restriction on the number of fail-
ures. However, each failure shall be analyzed as to cause and
remedial action necessary to reduce the possibility of its recurrence
in future equipment.