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 118 of 590

TM 9-1240-401-34&P

4-6. INITIAL INSPECTION

Item No.

2

3

4

5,6

7, 8

9

Item To Be Inspected

1

M145/145A1 TELESCOPE

MOUNT

MOUNTING SURFACES

DECAL AND lDENTl-

CATION PLATE

CROSS-LEVEL MECHANISN

KNOB

PITCH LEVEL AND

CROSS-LEVEL

LEDS

ELEVATION COUNTER

Procedures

Inspect M145/M145A1 telescope mount (1) for good overall

appearance with all parts securely tightened in place.

Inspect mounting surfaces (2) for burrs and corrosion; must be

free of burrs and corrosion.

Inspect decal and identification plate (3) for legibility; must be

legible and clearly defined.

Rotate cross-level mechanism knob (4). Cross-level mecha-

nism knob must turn smoothly with 3 to 6 pound-inches (0.339

to 0.678 N–m) running torque. Backlash must not exceed 1.0

mil at 0 setting. Rotation of cross-level mechanism knob must

move telescope socket 10° to right and 10° to left without

binding.

Check that pitch level (5) bubble and cross-level (6)

bubble are centered within one graduation for each vial.

Check LEDS (7 and 8) to ensure light is sufficient to clearly

define marking on level vials.

Operate mount through 1383 mils elevation and minus 50

roils depression. The elevation counter (9) must be accurate

within 0.5 mil as read on gunner’s quadrant.

4- 4