MIL-DTL-48554B
4.19.2 Shock. The telescope shall be mounted by the telescope mounting surface
and subjected to a shock test in accordance with 3.3.3. Adapter, Vibration and/or Shock,
10549198, may be used for this test. Upon completion of the shock test, the telescope shall
be inspected to and meet all the requirements of 3.4 through 3.19.
4.19.3 Vibration "A". The telescope shall be mounted by the telescope mounting
surface and subjected to a vibration test in accordance with 3.3.4 of this specification.
Adapter, Vibration and/or Shock, 10549198, may be used for this test. Upon completion of
the vibration test, the telescope shall be examined and inspected to the requirements of 3.4
through 3.19. All requirements shall be met.
4.19.4 Vibration "B". The telescope shall be mounted by the telescope mounting
surface and subjected to a vibration test in accordance with 3.3.5 of this specification.
Adapter, Vibration and/or Shock, 10549198, may be used for this test. Upon completion of
the vibration test, the telescope shall be examined and inspected to the requirements of 3.4
through 3.19. All requirements shall be met.
4.20 Interchangeability. The maximum interchangeability gage, 11747975, shall be
applied to the mounting surface (keyway) of the panoramic telescope to assure maximum
fit conditions. The gage shall be firmly seated in the keyway and the bolts seated against
their respective stops. Any telescope which does not accept the interchangeability gage,
without using force, shall be rejected.
4.21 Sealing and purging.
4.21.1 Optical assembly. Prior to the start of the test, secure the poppet valves in a
closed position. Pressurize the telescope with dry nitrogen as specified in paragraph 3.5.1.
The accuracy of the test equipment used shall be equal to or be greater than the accuracies
depicted on 8565556.
4.21.2 Counterbox assembly. Prior to the start of the test, secure the poppet valve
in the closed position. Pressurize the telescope's counterbox assembly with dry nitrogen as
specified in paragraph 3.5.2. The accuracy of the test equipment used shall be equal to or
be greater than the accuracies depicted on 8565556.
4.21.3 Purging assembled telescope. Connect the test equipment to the purging
valves of the telescope. Adjust the dry nitrogen pressure to the pressure specified in 3.5.3.
A dew point tester (standard type shop equipment) shall be used to measure the nitrogen
dew point for conformance with 3.5.3. Purging is to be performed at standard ambient
temperature and prior to performing any temperature test. Disconnect the purging
apparatus when the relief valve has reseated to maintain the internal pressure specified in
3.5.3.
4.22 Workmanship. A visual and tactile examination shall be performed to ensure
compliance with the workmanship requirements specified in 3.19.
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