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MIL-M-48557A(AR)
in accordance with 3.7.4.1 of this specification. Upon
completion of the vibration test, the mount shall be examined
and inspected to the requirements of 3.7.4.1.
4.7.1.5 Vibration "B". The quadrant shall be positioned on
Fixture 11747196 and vibrated in accordance with the frequency
and duration as specified in 3.7.4.2. At the conclusio nof the
test, the quadrant shall be subjected to a visual and tactile
examination and shall meet the requirements of 3.7.4.2.
4.8 Orientation. Test Fixture 10549201 shall be used for
the inspection of Mount M171. Position the test fixture on a
vibration free surface in accordance with the set-up
instructions on Drawing 10549201.
4.8.1 Telescope locating keys. Prior to positioning the
mount to Fixture 10549201, place the mount in holding Fixture
11747950 with the locating surface firmly seated and bolted
into place. Orient the mount and fixture into position to
accommodate the use of a vernier height gage and indicator.
The locating keys for the telescope shall be parallel to the
mount's mounting surface within the limits of 3.6e.
4.8.2 Mounting surface and keyway. Position the mount to
Fixture 10549201. The mounting surface (internal face) of the
mount shall be vertical. The mount's locating keyway shall be
horizontal and level within the limit specified in 3.5b.
4.8.3 Telescope mounting surface. Cross level the
telescope's mounting surface by turning the pitch and cross
level knobs until the level vial bubbles are exactly centered.
Next establish that the horizontal keyway of the mount is level
within 10 seconds of arc using a precision level vial.
Parallelism of the mounts keyway to the flat locating surface
for the telescope shall be measured with a calibrated gunner's
quadrant 8658940 by placing the quadrant across the locating
surface either in front of or behind the horizontal keys. The
telescope's locating surface shall be parallel to the keyway
within the limit specified in 3.6c.
4.8.4 Quadrant seating surface. The seating surface for
the fire control quadrant shall be parallel to the mounting
surface (internal face) of the mount within the limit specified.
in 3.6f. Affix leveling adapter, 10558353-11, to the telescope
mount for this test. This requirement can be tested in
conjunction with 4.8.5.
4.8.5 Quadrant locating keys. The locating keys for the
fire control quadrant shall be parallel to the mount's keyway
within the limit specified in 3.5g. Affix leveling adapter,
10558253-11, to the telescope mount for this test. The
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