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Plumb travel
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Telescopic,Panoramic:M115
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Gunner's aid counters



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MIL-T-46311B(MU)
4.6.17.2 Five mil click mechanism.- Set the lead knob in the DIRECT
fire position and rotate the azimuth knob through the full range of operation.
During rotation, a tactile examination shall be made to feel the detent action
required in 5 mil increments.  An audible examination shall be simultaneously
performed to listen for a distinct click resulting from positive detent
seating. At at least five readings throughout the range of operation, the
displacement from one increment setting to the next shall represent a 5 mil
angular change within the tolerance specified in 3.8.2.6. All the above
examinations shall be performed at standard ambient temperature (+60 +90F)
and the extreme operating temperatures of 3.3.2 to determine compliance with
3.8.2.6.
15 Mils steps .- The telescope shall be set at 3200 (zero)
4.6.18
on the azimuth counter and on the reset counter, with the gunner's aid counter
set at zero.  Rotate the azimuth knob to remove backlash. The vertical and
horizontal lines of the telescope reticle shall be coincident with the target
lines.  Rotate the gunner's aid knob in the opposite direction to the rotation
of the azimuth knob, and introduce 15 mils on the correct gunner's aid
counter.  Rotate the azimuth knob 15 mils in the same direction used to
remove the backlash. The reset counter shall return to the original setting
within the tolerance specified in 3.8.2.2. This test shall be repeated at
each position indicated for a plus deflection and a minus deflection reading.
4.6.19 Backlash (azimuth ).- The azimuth knob shall first be rotated in
one direction to bring the vertical line of the telescope reticle in coinci-
dence with the azimuth zero point on the target. Read and record the vernier
scale readings on the azimuth and the reset counter scales. continue the
rotation of the knob in the same direction, then reverse the direction of
the knob and, while sighting through the telescope, reposition the vertical
reticle line of the telescope in coincidence with the azimuth zero point on
the target, without overtravel. Read the vernier scales again and record
the readings, then compare them with the original set of readings. Any
difference is the amount of backlash in the azimuth mechanism. The backlash
shall not exceed the tolerances specified in 3.8.2.3.
4.6.20 Lift,- The vertical and horizontal lines on the telescope
reticle shall be positioned on the target as in the initial position of
4.6.15. The azimuth knob shall be rotated, first in oone direction and then
in the reverse direction. Lift is indicted if the line of sight is vertically
displaced from the original zero elevation setting, and it shall not exceed
the tolerance specified in 3.8.2.5. This examination shall be repeated at
the 3200, 4800, zero, and 1600 mil settings.
4.6.21 Rapid traverse.- The azimuth knob of the telescope shall be
rotated at the speed and for the length of time specified in 3.8.3.1. During
this test, the reset counter shall follow the azimuth counter within the
tolerance specified in 3.8.3.1. This test shall be conducted in both
directions.
4.6.22 Reset counter.- The reset counter shall be resettable to 3200
when the knob is depressed and rotated in a counterclockwise direction, to
determine compliance with 3.8.3.2.
14

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