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|  MIL-M-50383A(MU)
4.6.1.1 Temperature test. - The mount shall be subjected to Test
Procedure I of MIL-F-13926; however, the temperature specified in 3.4.1
and 3.4.2 shall apply. When the mount has been stabilized at the
temperature specified, the result of each specific test shall conform
to the limits outlined in 3.4.1 and 3.4.2 using test procedures outlined
herein.
4.6.2 performance.
4.6.2.1 Vibration.- The telescope mount shall be vibrated in
accordance with Test procedure V of MLL-F-13926, however, the duration
frequency and amplitude shall be as specified in 3.4.3. After completion
of the vibration test, the mount shall be inspected for broken and damaged
parts using visual and tactile inspection techniques to assure compliance
with 3.3.2.
4.6.2.2 Orientation.- Secure the mount to the extended trunnion
of a level and crosslevel type of fixture having the accuracies depicted
on Drawing F6523553 by means of an adapter having accuracies shown as
Part 6 on Drawing F10555619. Secure an Inspection Aid Adapter having
the accuracies depicted on Drawing F10553898 to the opposite extended
trunnion of the level and crosslevel type fixture by the means provided.
Prior to securing the mount, assemble supporting adapter by the means
provided and set fixture indices to indicate zero elevation and zero cant.
Place a 1/8" aperture over the eyepiece of the collimating telescope and
place collimating telescope F5549108 in "V" of adapter and position a
plumb line approximately 40 feet from the collimator's objective lens
and in line with collimator's line of sight. This line of sight to be
considered as the intersecting point of the horizontal and vertical
reticle line. Rotate fixture elevating handwheel and observe parallelism
between optical axis and plumb line. They must be parallel. Make all
adjustments by means of fixture leveling screws; reset crosslevel index
to zero. Return fixture to zero elevation and place a precision level
over adapter keys. The keys are considered level when the precision
level indicates level in one position and when rotated 180 degrees from
the original level setting. Secure adapter to fixture. Sight through
the collimator and rotate collimator in "V" to position vertical
reticle line in coincidence with the plumb line. Place target Figure II
behind plumb line and coincide target lines "A" and "B" to collimator's
horizontal and vertical reticle lines. Remove collimating telescope
from test fixture and assemble the mount to test adapter. Secure by
means of 4 bolts. Secure locator pin Part 16 shown on Drawing F10555619
to fixture. Rotate crosslevel knob and pitch knob to level the pitch
and cross level bubbles of the mount to within limit specified in
3.5.1(C). Place an inspection aid A8658940 on a parallel over each of
the horizontal surfaces perpendicular to the mounting face, then over
both surfaces parallel to the mounting surface and then over the
quadrant gun pads. All readings must indicate level within the limit
outlined in 3.5.l(d). Seat "V" block Part I shown on Drawing F10555619,
and collimator over locating pins of mount with base of "V" block resting
on horizontal top seating surface. Sight through collimator and observe
coincidence between the intersecting point of target lines "C" and "D"
Figure II and the collimator's optical line of sight. They must coincide
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