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Page Title:
Effects of Vibration and Shock. |
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|  MIL-A-48449A(AR)
4.6.5
Vibration.
4.6.5.1 Vibration "A".
The Alignment Device while in its
carrying case (or equivalent), shall be vibrated in accordance
with-Procedure IX, Part 1 of MIL-STD-81O, except as specified
Upon completion of the vibration cycling, the
in 3.8.4.1.
shall be subjected to the examinations and
alignment device
tests to determine conformance with the requirements of 3.8.4.1.
The alignment device shall be
4.6.5.2 Vibration "B".
secured to the vibration table by suitable adapters with the
Lever ,
tube and head parallel to the vibration table surface.
The alignment device shall then
10544452, shall be immobilized.
be vibrated in accordance with the conditions specified in
completion, the unit shall be subjected to the
3.8.4.2.
Upon
examinations and tests to determine conformance with the
requirements of 3.8.4.2.
Subsequent to
4.6.6 Effects of Vibration and Shock.
vibration or shock, the alignment device shall be thoroughly
examined for physical defects resulting from poor workmanship
and materials to determine conformance with 3.8.5, prior to
being subjected to the remaining tests specified herein. A
visual examination shall be made for missing or damaged parts.
A tactile examination shall also be conducted to determine
An audible
looseness or improper functioning of moving parts.
examination shall be made of the unit by shaking it and listen-
ing for loose internal parts or broken optical components, such
Conditions of 4.6.1 shall be
as lenses and reticle, etc.
reestablished and the line of sight established prior to vibra-
tion or shock shall not have deviated in excess of the tolerance
specified in 3.8.5.
Any one of the possible defects defined
above shall be cause to consider an alignment device defective.
Items which have passed the above examinations shall be
subjected to the tests specified in 4.6.7 through 4.6.13.
The internal pressurizing of the alignment
4.6.7 Sealing.
device to test sealing shall be Performed with special testing
equipment conforming to Drawing F8565556, Pressure Tester-Two
Station.
The pressure shall be applied through an appropriate
Pressurize the unit with dry nitrogen gas to 10.0
adapter.
The dry nitrogen gas shall have a dew point at
0.10 psig.
The applied pressure shall be
least as low as minus 25F.
Any evidence of leakage at
retained for a minimum of 2 hours.
the end of the 2 hour time period, shall not exceed the
tolerance specified in 3.9.1, as measured on the pressure gage
of the testing equipment.
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