MIL-DTL-48557B
3.7.7 Pitch adjustment backlash. Backlash of the pitch travel mechanism shall not
be greater than 1.5 mils at zero elevation.
3.7.8 Cant adjustment range. From a level starting position and using only the cant
adjustment, the mount shall travel through an excursion of not less than 178 mils to the left
and not less than 178 mils to the right.
3.7.9 Cant adjustment backlash. Backlash of the cant travel mechanism shall not be
greater than 1.5 mils at zero elevation and zero cant.
3.7.10 Mount rigidity. With an established line of sight starting from a position of
zero elevation and zero cant, the line of sight shall not exceed the total lateral movement
specified in Table II at the corresponding elevations when a 20 pound horizontal load is
applied to the telescope support perpendicular to the keyway and subsequently released.
This shall be done from both the left side and the right side of the mount at all the
elevations specified in Table II.
TABLE II. Mount rigidity.
Elevation (mils)
Cant angle (mils)
Total lateral movement
(mils)
0
0
0.25
800
0
0.75
1100
0
1.75
1333
0
3.50
3.7.11 Azimuth correction. The mount shall make left and right azimuth
corrections in accordance with the requirements and tolerances of Table III.
TABLE III. Azimuth correction.
Elevation (mils)
Cant angle (mils)
Azimuth correction
Allowable
(mils)
tolerance (mils)
300
88.9
27.0
± 0.3
600
88.9
59.6
± 0.7
900
88.9
108.8
± 1.5
1200
88.9
216.8
± 1.8
300
177.8
54.5
± 0.6
600
177.8
120.3
± 1.0
1100
177.8
342.4
± 2.0
3.8 Level vial illumination. The level vial bubbles and graduation lines shall be
clearly distinguishable when observed in ambient light conditions ranging from dusk to
darkness.
6
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