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Boresight Retention Inspection - continued
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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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Head Assembly Excursion and Plumbline Travel Inspection
TM 9-1240-375-34&P
0100 00
2.
Set azimuth test fixture scale (3) to read 4800 mils.
NOTE
When checked at 3200 and 0000 mils, backlash in the azimuth mechanism shall not
exceed 0.5 mil as read on the azimuth counter and 0.75 mil as read on the deflection
counter.
3.
Turn azimuth knob (4) clockwise until vertical reticle line is centered with collimator reticle target.
Record reading.
4.
Turn azimuth knob (4) clockwise one complete turn.
NOTE
When turning azimuth knob counterclockwise, be careful not to go past the center of
target.
5.
Turn azimuth knob (4) counterclockwise until vertical reticle line is centered on collimator reticle
target. Record readings on azimuth counter (5) and deflection counter (6).
6.
Compare with reading recorded in step 3. Difference must not exceed readings stated in note following
step 2.
3
1 fc 6 5 8
7.
Rotate azimuth test fixture scale (3) to 1600 mils and repeat steps 3 through 6.
0100 00-13

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