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Page Title:
Mount Rigidity Inspection - continued |
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 TM 9-1240-375-34&P
0073 00
7
8
1 fc 4 7 4
4.
Rotate azimuth knob (7) clockwise to 4800 mils on azimuth counter (8). Align target to reticle line.
10
9
1 fc 4 7 5
5.
While sighting optical instrument support (9) on target, use push-pull gage (10), and apply 20-lb
(9.07 kg) load on right side, 2.3 in. (5.84 cm) from center of optical instrument support.
6.
Release load and record amount of movement.
7.
Place push-pull gage (10) on left side of optical instrument support (9), and apply 20-lb (9.07 kg) load,
2.3 in. (5.84 cm) from center of optical instrument support.
8.
Release load and record amount of movement.
9.
Total of steps 6 and 8 must not exceed total movement listed in Table 1.
NOTE
If movement exceeds amount allowed in Table 1, recheck M171/M171A1 mount for
proper assembly. If movement still exceeds amount allowed in Table 1, return to
depot maintenance.
10.
Repeat steps 1 through 9 using elevations listed in Table 1.
0073 00-33
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