Quantcast Checking the Effect of the Correction Counter Setting on the Elevation Counter and Level Bubble

 

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Elevation Accuracy Inspection (200-Mil Increments) - 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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Torque Inspection -820360298
TM 9-1240-375-34&P
0057 00
10.
Set fire control quadrant (13) to 200 mils. Place on top of mounting bracket (1) and zero using
micrometer knob (14).
NOTE
Micrometer dial will indicate any error. Error should not exceed 0.5 mil (1.0-mil total
spread).
11.
Repeat steps 1 through 10 with fire control quadrant set at elevations of 400, 600, 800, 1000, 1200, and
1400 mils. Error should not exceed 0.5 mil.
Checking the Effect of the Correction Counter Setting on the Elevation Counter and Level Bubble
2
3
4
5
1
1 fc 2 6 2
1.
Mount M17/M18 or M17A1/M18A1 quadrant (1) on optical equipment test fixture (2). Refer to
Mounting M17/M18 or M17A1/M18A1 Quadrant on Optical Equipment Test Fixture.
NOTE
Observe bubble in elevation level (3) during steps 2 through 5. It must remain
centered within one vial graduation.
2.
Turn correction knob (4) clockwise to -50 mils.
Check that elevation counter (5) reads 50 0.5 mils.
3.
4.
Turn correction knob (4) counterclockwise to 50 mils.
Check that elevation counter (5) reads 9950 0.5 mils.
5.
0057 00-15

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