Azimuth Correction Inspection

TM 9-1240-375-34&P

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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 fc 4 7 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

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.

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