TM-9-1240-401-34-P

TELESCOPE MOUNT M146: M118A2 AND M118A3; TELESCOPE MOUNT M145: M145A1; PANORAMIC TELESCOPE: M117 AND M117A2; FIRE CONTROL QUADRANT: M15; PERISCOPE: M42

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

JULY 1993

TM-9-1240-401-34-P - Page 242 of 590

TM 9-1240-401-34&P

5.1-7. GENERAL SUPPORT INITIAL INSPECTION - continued

Item No.

Item To Be Inspected

6

CORRECTION KNOB

7

CROSS-LEVEL VIAL

8

ELEVATION COUNTER

Procedures

Check that torque required to turn correction knob in either direction

between detent positions does not exceed 3 pound-inches (0.339 N-

m).

Check that cross-level vial bubble is centered within one graduation

line when quadrant is in reference level position. (Refer to final

inspection, para 5.1-24, to level the cross-leveling fixture.) Depress

M15 quadrant to 200 mils by rotating upper section of fixture and

check that level vial bubble remains centered. Elevate M15 quadrant

to 1300 mils and check that level vial bubble remains centered.

a.

Check that elevation counter registers at least 1383 mils when

elevation knob (4) is turned clockwise to stop and not more than

9772 mils when turned counterclockwise to stop.

b.

With M15 quadrant in reference level position (ref. final inspection,

para 5.1-24, for leveling procedures) and correction counters (9)

set at 00, check that elevation counter registers 0000 + 0.5 mil.

c.

Check that all numerals aline within 1/16 inch (1.588 mm).

5.1-8

Change 1