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Boresight Retention Inspection
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TM-9-1240-375-34-P Quadrant Fire Control: M17 (1290-01-037-3883) and M17A1 (1290-01-515-8260); Mount Telescope and Quadrant: M171 (1240-01-039-7273) Manual
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Azimuth Knob Backlash Inspection
TM 9-1240-375-34&P
0100 00
TEST AND INSPECTION - Continued
Boresight Retention Inspection - Continued
13
6
9
7
3
1 fc 6 5 6
11.
Turn azimuth knob (6) until head assembly (13) makes one complete revolution.
12.
Check that 3200 appears on azimuth counter (9).
Check that vertical reticle line is centered on collimator reticle target or within 0.25 mil.
13.
Check that reading on deflection counter (7) is within 0.25 mil of reading on azimuth counter (9).
14.
15.
Rotate azimuth test fixture scale (3) to 1600 mils.
16.
Repeat steps 4 through 14 with 0000 on deflection counter (7) and azimuth counter (9).
Azimuth Knob Backlash Inspection
1
4
5
6
3
2
1 fc 6 5 7
1.
Mount M137/M137A2/M137A3 telescope (1) on azimuth test fixture (2). Refer to Mounting Telescope
to Azimuth Test Fixture.
0100 00-12

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