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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.
12

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