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Operability, extreme temperatures |
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|  MIL-L-60244A(MU)
linkage assembly shall show no evidence of physical failure as specified
in 3.4. The linkage assembly shall then be subjected to the tests specified
in 4.6.3 through 4.6.6 inclusive, to determine overall compliance with 3.4,
4.6.2 Operability, extreme temperatures. - Testing equipment utilized
in this test shall be in accordance with the "Test Facilities'! requirements
of MIL-F-13926 and the applicable conditions of 3.5. The linkage assembly
shall be exposed to each specified temperature for a period of five hours.
At the end of each five hour period and while still at the temperature
extreme the linkage assemblies shall be subjected to the test specified
in 4.6.5 and shall conform to the applicable requirement of 3.7.1 for each
temperature extreme.
4.6.3 Vibration. - Perform this test with the linkage assembly
positioned on testing equipment that conform to 4.5.2.3.3 and 4.5.2.3.4.
The linkage assembly shall be vibrated in accordance with Procedure IX,
Part 1, of MIL-STD-81O, except that the frequency, frequency cycling, and
amplitude of vibration shall be as specified in 3.6. Upon completion of
the vibration cycling the linkage assembly shall be subjected to the tests
specified in 4.6.3.1.
4.6.3.1 Examination. - Subsequent to the test in 4.6.3 the linkage
assembly shall be thoroughly examined for any evidence of physical failure.
A visual and tactile examination shall be made for missing or damaged parts.
A tactile examination shall also be conducted to determine looseness or
improper functioning of moving parts. An audible examination shall be made
of the linkage assembly by shaking it and listening for loose internal
parts or broken components. Any one of the possible defects defined above
shall be cause to consider an assembly defective. The linkage assembly
shall be subjected to the tests in 4.6.4 through 4.6.6 inclusive, to
determine overall compliance with 3.6.
4.6.4 Orientation. - The following test shall be performed with
the linkage assembly positioned and conditioned in accordance with 3.7a
through 3.7e on special testing equipment that conforms to the requirements
of 4.5.2.3.1.
4.6.4.1 Backlash. - With backlash removed for direction of tra-
vel, actuate the Connector 8635540 by means of the testing equipment un-
til Surface "X" of Coupling 8650152 is positioned 22 degrees 30 minutes
as shown on Drawing F8287301. Direct a line of sight through the view-
ing collimator to the reflecting (auto-collimating) surface of the mirror.
While viewing through the collimator, adjuct the mirror until the horizontal
reticle line of the reflected image is superimposed on the horizontal
reticle line of the viewing collimator. Record the position of the commenctor.
Continue actuation of the connector in the same direction of travel until
Surface "X" of the coupling is positioned, approximately 33 degrees, then
actuate the connector in the opposite direction of travel (with backlash
included) until the connector is returned to the recorded lateral position
without overtravel. Record the boresight point (intersecting point of the
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