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Collimation, Pre-Vibration/Pre-Shock setting
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Elbow Assembly, Passive : 11733401
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Performance, elbow assembly with image tube installed



img
MIL-E-48441A(MU)
4.6.5.1. Do not disturb the boresight knob scale settings of (4)
during transfer of the elbow assembly. Observe through the elbow assembly
eyepiece and adjust by means of the boresight knobs to obtain coincidence
of the elbow reticle boresight cross with the target image. Boresight
knob adjustments shall not exceed the tolerance specified in 3.6.6, as
measured on the boresight knob scales.
4.6.5.4 Post-Vibration/Post-Shock examination.- Subsequent to the
test in 4.6.5.3, the elbow assembly shall be thoroughly examined for
physical failure resulting from poor workmanship and materials. Prior
to being subjected to the remaining tests specified herein, a visual
examination shall be made for missing or damaged parts. With the ex-
ception of the slip scales, a tactile examination shall be made for
functioning of moving parts (boresight knobs, boresight knob scales,
etc.) for undue irregularities of movement, friction or looseness. An
audible examination shall be made of the elbow assembly for loose internal
optical and mechanical components, any one of the possible defects
defined above shall be cause to consider an elbow assembly defective,
4.6.5.5 Vibration "A''/Shock.- In addition to first article sample,
the tests in 4.6.5.5.1 (Vibration "A") and 4.6.5.5.2 (Shock) shall be
performed on three elbow assemblies randomly selected at 25%, 50% and
75% completion of the production contract.
4.6.5.5.1 Vibration "A". - This test shall be performed on elbow
assemblies procured as a repair part item. When the elbow assembly is
provided with a complete periscope this vibration test will not be
required when the complete periscope is to be vibrated. Prior to performing
this test, the elbow assembly shall be subjected to  the test procedure
specified in 4.6.5.l to determine compliance with 3.6.4. Subsequent to
the test of 4.6.5.1, the elbow assembly shall be vibrated in accordance
with Test Method 514.2, Procedure VIII (Tracked Vehicles) of MIL-STD-
810, except the test level and frequency range shall be as specified in
3.6.5.1. Vibration shall be applied along each of three mutually perpendicular
axes of the elbow assembly. Vibrating equipment capable of providing
the test level and frequency ranges specified above-shall be utilized
for this test. The vibrating equipment shall be in accordance with the
"Tolerance of Test Conditions" specified in the "General Requirements"
of MIL-STD-810. The vibrating equipment shall also be capable of vibrating
the elbow assembly along three mutually perpendicular axes while the
elbow assembly is maintained in its normal mounting or operating position
(as depicted in the front view on Sheet 1 of Drawing F11733401). The
elbow assembly shall be clamped on the vibrating equipment by means of
an appropriate adapter having the same interface features as periscope:
M32E1, M35E1 and M36E1. Prior to vibration, the image intensifier tube
and the reticle projector lamp shall be energized in accordance with
3.6.5.1. After allowing a 15 second tube stabilization period, the
screen surface of the tube shall be illuminated and the reticle pattern
shall be projected into the optical system when observed through the
elbow assembly eyepiece. The elbow assembly shall then be vibrated in
accordance with the test procedure specified above and swept logarithmically
for the time period specified in 3.6.5.1. During each vibration sweep
19

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