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Azimuth Mechanism 15-mil Steps Inspection - continued -820360618
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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 5-mil Click Lead Mechanism Inspection
TM 9-1240-375-34&P
0100 00
5
9
10
1 fc 6 7 5
10.
Set correction counter (9) at L-15.
11.
Sighting through eyeshield (10), turn azimuth knob (4) clockwise to deflect line of sight 15 mils, as seen
on reticle. Check that deflection counter (5) returns to 3200 0.25 mils.
12.
Repeat step 2 with settings of 0000, 1600, and 3200 mils, and azimuth counter settings of 4800, 0000,
and 1600 mils respectively. Then repeat step 11.
13.
Repeat steps 2 through 11 in counterclockwise rotation with backlash eliminated and correction
counter set at R-15.
14.
Repeat step 2 with settings of 3200, 1600, and 0000 mils, and azimuth counter settings of 1600, 0000,
and 4800 mils respectively. Then repeat step 11.
Azimuth Mechanism Lift Inspection
1
3
2
1 fc 6 7 6
1.
Mount M137/M137A2/M137A3 telescope (1) on azimuth test fixture (2). Refer to Mounting Telescope
to Azimuth Test Fixture.
2.
Verify boresight. Refer to Boresight Retention Inspection.
0100 00-23

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