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 178 of 590
5-4
TM 9-1240-401-34&P
5-6. INITIAL INSPECTION
Item No.
2
3
4
5
6
7
8
9
10
11
Item To Be Inspected
1
M117/M117A2 PANORAMIC
TELESCOPE
IDENTIFICATION PLATE
MOUNTING SURFACES
EYESHIELD
PURGING VALVE STEM AND
AIR VALVE CAP
WINDOW
ELEVATION KNOB
RESET COUNTER KNOB
ELBOW ASSEMBLY
AZIMUTH KNOB
GUNNER’S AID KNOB
Procedures
Inspect M117/M117A2 panoramic telescope (1) for completeness
and secureness of parts; must be complete and secure.
Inspect identification plate (2) for legibility; must be legible
and clearly defined.
Inspect mounting surfaces (3) for burrs and corrosion; must
be free of burrs and corrosion.
Inspect eyeshield (4) for security of attachment and damage
such as deterioration, cuts, or tears; must be secure, without tears
or deterioration.
Inspect purging valve stem and air valve cap (3) for damage such
as bends or breaks and ability to hold pressure; must not be bent
or broken, and must hold pressure.
Inspect window (6) for dirt, fungus, or condensation which may
obstruct view; must be clean and free of moisture.
Inspect elevation knob (7) for smooth operation without binding
or jerky movement. Operates smoothly without binding.
Inspect reset counter knob (8) for smooth operation without binding
or jerky movement. Operates smoothly without binding.
Inspect elbow assembly (9) for smooth travel through full range of
movement. Operates smoothly without binding.
Inspect optical quality by looking through eyepiece.
View should be clear with no objectionable signs of dirt,
lint, cracked lenses, or condensed moisture.
Inspect azimuth knob (10) for smooth operation through full range
in either direction with no binding or jerky motion.
Inspect gunner’s aid knob (11) to be sure that it does not bind.
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