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|  MIL-M-60170A(MU)
equipment that conforms to 4.5.2.3.2.5. The mount shall be vibrated in
accordance with Procedure IX, Part 1 of MIL-STD-810 except that the
frequency, frequency cycling and amplitude of vibration shall be as
specified in 3.5. Immediately following the vibration cycle, and prior
to the examination for evidence of physical failure, the mount shall be
subjected to the test in 4.6.5. caution shall again be exercised during
transfer of the mounting plate assembly with the mount to the line of
sight test stand. upon completion of the test in 4.6.5, the mount shall
be subjected to the tests specified in 4.6.4.1.
4.6.4.1 Examination.- Subsequent to the test in 4.6.5, the mount
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 loose-
ness or improper functioning of moving parts. An audible examination
shall be made of the mount by shaking it and listening for loose parts
or broken components. Any one of the possible defects defined above
shall be cause to consider an assembly defective. The mount shall be
subjected to the tests in 4.6.6 through 4.6.10 inclusive to determine
overall compliance with 3.5.
4.6.5 Rigidity, post-vibration.- Conduct this test subsequent to
vibration, and prior to the examination for physical failure resulting
from vibration. Position the mounting plate assembly with the mount on
the line of sight test stand as in 4.6.3. View through the telescope
and observe for coincidence of the real and reflected images of the tele-
scope reticle lines. Any lack of coincidence between real and reflected
images shall not exceed the tolerance specified in 3.7.3, as measured
with the angle reading telescope. For this test, the angle reading
telescope micrometer knobs setting established in 4.6.3 shall be used
as the zero line of sight setting (coincidence of real and reflected
images).
4.6.6 Mounting repeatability.- Position the mount on the testing
equipment as specified in 4.6.3. Install the body assembly device in
the mount. View through the telescope and establish coincidence of the
real and reflected images of the telescope reticle lines, if necessary.
Record the readings of the telescope micrometer knobs. Remove the body
assembly device from the mount, then re-assemble the body assembly
device to the mount, a minimum of 3 times. Coincidence of the real and
reflected images shall be verified after each re-assembly of the body
assembly device to the mount. Any lack of coincidence of the real and
reflected images resulting from this removal and re-assembling of the
body assembly device to the mount shall be measured and recorded. The
mount shall conform to the requirements of 3.7.2, as determined by the
recorded values obtained at each re-assembly of the body assembly device
to the mount.
The wiper blade shall be raised during this test to avoid
CAUTION
damage to the blade.
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