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|  MIL-M-48559A(AR)
3.
REQUIREMENTS
3.1 First article. When specified, a sample shall be
subjected to first article inspection (see 4.2 and 6.2).
3.2 Materiels. Materiels shall be in accordance with
drawings, material specifications, and general specifications
forming a part of this specification.
3.3 Fabrication. The mount shall be manufactured in
accordance with Drawing 10554823 and drawings pertaining thereto.
3.4 General specifications. The contractor shall
be
responsible for the compliance with the requirements of
specification MIL-F-13926.
3.5 Orientation. Whenever specified herein, the conditions
listed below shall apply:
a. The mounting surface of the mount shall be vertical
b. The locating keyway of the mount shall be horizontal
c. The surface to mount the M18 Quadrant shall be
vertical
d. The aligning surfaces of the 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-
90 foot pounds.
3.6 Alignment of locating surfaces. These requirements
shall be met with conditions of 3.5 established.
3.6.1 Quadrant mounting surfaces.
3.6.1.1 Surfaces for quadrant. The mounting surfae for the
quadrant shall be parallel to the mounting surface of the mount
within 1 minute of arc (0.3 mil).
3.6.1.2 Locating keys for M18 Quadrant. The locating keys
for the quadrant shall be parallel to the locating keywary in the
mount mounting surface within 2 minutes of arc (0.6 mil).
3.6.2 Mounting surfaces for gunner's quadrant. The mounting
surfaces for the gunner's quadrant shall be parallel to the keyway
in the mount mounting surface within 45 seconds of arc (0.225 mil).
3.7 Temperature conditions. Except as specified in 3.7.1,
3.7.2, 3.8.1 and 3.8.2 the requirements of this specification
shall be met at a temperature between +60 and +90 Fahrenheit (F)
0
(+16 and +36 Centigrade (C)).
3
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