TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download
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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.