MIL-DTL-48559B
to the vibration test equipment. Upon completion of the vibration test, the mount shall be
examined and inspected to meet the requirements of 3.5 through 3.10 inclusive.
4.4.5 Vibration "B". The mount shall be mounted utilizing the keyway and four
mounting bolts torqued to 85-90 foot-pounds and then subjected to the vibration
requirements in accordance with 3.4.5. Fixture 11747193 may be used to adapt the mount
to the vibration test equipment. Upon completion of the vibration test, the mount shall be
examined and inspected to meet the requirements of 3.5 through 3.10 inclusive.
4.5 Alignment of locating surfaces. Test fixture 10558253 or functional equivalent
shall be used for the inspection of M172A1 mount. Position the test fixture on a vibration
free surface in accordance with the set-up instructions outlined on drawing 10558253.
Wall target 10558253-13 shall be positioned and fixed in a suitable area. Follow all set-up
and operating instructions prior to securing the mount to the fixture. Verifications shall be
done with the starting position of the mount as follows:
a. The mounting surface of the mount shall be in a vertical plane.
b. The locating keyway of the mount shall be in a horizontal plane within 10
seconds.
c. The surface to mount the M18A1 quadrant shall be in a vertical plane.
d. The aligning surfaces of the M138A1 direct fire telescope mounting bracket shall
be perpendicular to the mounting surface of the mount.
e. The four mounting bolts shall be torqued to 85 to 90 foot pounds.
4.5.1 Mounting surfaces for M18A1 quadrant. With the mount oriented as stated in
4.5, insert quadrant adapter 10558253-11 on the quadrant mounting surface of the mount.
Place inspection aid, 8658940, on the adapter surface perpendicular to the quadrant
mounting surface and the mounting keys of the mount. The surface of quadrant must be
vertical and parallel to the mounting surface within the requirement of 3.5.1 as measured
with the inspection aid.
4.5.2 Locating keys for M18A1 quadrant. With the mount oriented as stated in 4.5,
and adapter 10558253-11 positioned on the quadrant mounting surface of the mount, place
inspection aid, 8658940, on the adapter surface parallel to the quadrant mounting surface
and the mounting keys of the mount. The locating keys for the quadrant shall be parallel to
the mounting surface of the mount within the requirement of 3.5.2 as measured with the
inspection aid.
4.5.3 Mounting surfaces for gunner's quadrant. With the mount oriented as stated
in 4.5, place inspection aid, 8658940, on the mounting surfaces for the gunner's quadrant.
The mounting surfaces for the gunner's quadrant shall be parallel within the requirement of
3.5.3 as measured with the inspection aid.
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