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|  MIL-H-48620(AR)
specified in 3.9.2. During this test, the input coupling shall be
immobilized to any position that shall prevent it from contacting
the travel stops. Immediately following the vibration cycle, and
prior to the examination for physical defects resulting from poor
workmanship and materials, the head assembly shall be subjected to
the tests in 4.5.8 and 4.6.9. Caution shall be exercised during
transfer of the head assembly. Subsequent to the tests in 4.6.8 and
4.6.9, the head assembly shall be thoroughly examined for physical
defects resulting from poor workmanship and materials to determine
compliance with 3.9.2, 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 be made for
functioning of moving parts, for irregularities of movement,
friction or looseness. An audible examination shall also be made of
the head assembly for loose internal optical and mechanical
components. Any one of the possible defects defined above shall be
cause to consider a head assembly defective. Head assemblies which
have passed the above examinations shall be subjected to the
remaining tests specified in 4.6.3, 4.6.4.4 through 4.6.6 inclusive
and 4.6.10 through 4.6.12 inclusive.
4.6.7.3 Shock. - This test shall be performed on head assemblies
procured as a repair part item. When the head assembly is provided
with a complete periscope, this shock test will not be required when
the complete periscope is subjected to shock. Prior to performing
this test, the head assembly shall be subjected to the test
procedure specified in 4.6.4.1 to determine compliance with 3.7.1
and 3.7.2. The shock equipment and test procedure shall be in
accordance with MIL-STD-81O, Method 516.2, Procedure I, except
conditions such as "G" values, time duration and wave form shock
pulse shall be as specified in 3.9.3. The head assembly shall be
clamped on the shock equipment by means of an appropriate adapter
having the same interface features as Mount Periscope: M118E1. The
head assembly shall then be shocked in accordance with the test pro-
cedure specified above, except the application of shock along the
vertical axis shall be in one direction only (normal operating
position of the head assembly). During this test, the input
coupling shall be immobilized to any position that shall prevent it
from contacting the travel stops. Immediately following the shock
test and prior to the examination for physical defects resulting
from poor workmanship and materials, the head assembly shall be
subjected to the tests in 4.6.8 and 4.6.9. Caution shall be
exercised during transfer of the head assembly. Subsequent to the
tests in 4.6.8 and 4.6.9, the head assembly shall be thoroughly
examined for physical defects resulting from poor workmanship and
materials to determine compliance with 3.9.3, prior to being
subjected to the remaining tests specified herein. A visual
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