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TM 9-1240-375-34&P
0073 00
10
1 fc 4 5 0
9.
Rotate cross level knob (10) clockwise and stop when coincidence is obtained.
12
11
1 fc 4 5 1
10.
Return cross-leveling fixture (11) to zero elevation.
11.
Re-center bubble in cross level vial (12). Refer to Mounting the M171/M171A1 Mount on Cross-
Leveling Fixture, steps 13 through 20.
12.
Sight on target and repeat step 8 above until deviation is less than 0.25 mil for -270 to 800 mils
elevation and 0.50 mil for 801 through 1333 mils elevation. If either deviation cannot be eliminated,
the M171/M171A1 mount is defective. Return M171/M171A1 mount to depot maintenance.
0073 00-21

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