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Backlash Inspection - continued -820360292
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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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Elevation Counter and Correction Counter Excursion Range Inspection
TM 9-1240-375-34&P
0057 00
9
11
12
1 fc 2 5 3
8.
Using micrometer knob (12) on fire control quadrant (9), center bubble in fire control quadrant level
(11) and record reading.
NOTE
The difference between the readings recorded in steps 5 and 8 will give the amount of
backlash.
Backlash shall not exceed 0.7 mil at any elevation or depression setting.
9.
Repeat steps 4 through 8 at elevation settings of 150-mil depression, 200-mil elevation, 800-mil
elevation, and 1400-mil elevation. Use fire control quadrant set on optical equipment test fixture
adapter to initially set elevations.
Elevation Counter and Correction Counter Excursion Range Inspection
2
1
1 fc 2 5 4
1.
Turn elevation knob (1) clockwise as far as possible. Elevation counter (2) must read 1433 mils or
greater.
0057 00-11

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