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MIL-M-45671E(MU)
90% of the prescribed tolerance limit, and permit positive rejection when
non-conforming. Construction shall be such as to facilitate routine
calibration of test equipment.
4.6 Test methods and procedures.
4.6.1 Environmental.
4.6.1.1 Operating temperatures.- The testing equipment utilized
in this test shall be in accordance with the "Test Facilities" require-
ments of MIL-F-13926 and the conditions of 3.3.1. The mount shall be
exposed to the temperature extremes specified in 3.3.1 for a minimum of
2 hours at each extreme. At the end of each 2 hour period and while
still at each temperature extreme, the mount shall be subjected to the
tests specified in 4.6.3 to 4.6.6.3 inclusive.
4.6.1.2 Vibration.- The mount shall be secured to a medium and
vibrated as required by 3.3.2. Subsequent to the vibration a visual and
tactile inspection shall be made for physical damage and loose components
or assemblies. After which the mount shall meet all the requirements
specified herein.
4.6.2 Orientation. - A testing device (see Figure I), shall be
fabricated to support and position the mount as specified in 3.4, with
enought area to allow the insertion of and removal of the gages specified
in 4.6.7. The testing device shall also provide a means of applying
and measuring pressure from opposite directions as required by 3.5.2.
4.6.3 Safety latch. - The gages specified in 4.6.7 shall be utilized
for this test. The mount shall be positioned in the testing device
(Figure I) with the headrest in the upper most position and secured. The
maximum interchangeability gage shall be inserted upward into the mount
until the safety latch is activated and snaps into position. Allow the
safety latch to hold the gage in the mount. (caution should be exercised
before releasing or removing hands from medium to prevent injury, if
safety latch fails.) To remove the gage, the inspector will exert an
upward pressure with one hand and activate the spring loaded safety latch
with the other. The gage can be lowered sufficiently with the one hand
and then removed from the mount as specified in 3.5.1. Perform the above
test using the minimum interchangeability gage to determine conformance
with 3.5.1.
4.6.4 Holding features. - Each gage shall again be inserted into
the mount as in 4.6.3. A dial indicator (Figure I) graduated in .0001
increments shall be positioned so that it contacts at either the front
or rear of the gage at a point specified in 3.5.2 and adjusted to read
zero with the indicating hand. Apply a slow steady pressure of 10
pounds to the opposite side from the dial indicator and then upon
releasing the pressure, the indicating hand of the dial indicator shall
not exceed the tolerance specified in 3.5.2. Reverse the equipment and
7

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