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Mount Rigidity Inspection - continued -820360443
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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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Table 2. Azimuth Correction Data.
TM 9-1240-375-34&P
0073 00
TEST AND INSPECTION - Continued
Azimuth Correction Inspection - Continued
NOTE
After each elevation setting, recenter bubble in elevation level vial.
When M137/M137A2/M137A3 telescope is aligned on target, final movement of
azimuth knob should be in a clockwise direction.
1
3
13
1 fc 4 7 9
9.
Look through eyeshield (13) of M137 telescope (1) and align M137/M137A2/M137A3 telescope reticle
line on wall target.
NOTE
The variance in readings is dependent upon which way the 88.9 mils is applied to the
fixture. The 27 0.3 mils would be subtracted from the 4800-mil reading.
10.
Azimuth counter (3) should read 4837 0.3 mils or 4773 0.3 mils.
11.
Repeat steps 5 through 10 using elevations, cant angles, azimuth corrections, and tolerances in Table
2.
12.
Repeat steps 5 through 10, setting cant in opposite direction.
NOTE
If azimuth counter readings cannot be obtained, check to ensure proper maintenance
procedures were followed when the M171/M171A1 mount was reassembled. If
azimuth correction readings are still unobtainable, there is a possibility of
excessively worn or bent depot parts. Return the M171/M171A1 mount to depot
maintenance.
0073 00-36

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