MIL-T-62222 Tank, Combat, Full-Tracked: 105Mm Gun, M48A5This specification covers one type of full-tracked, armored combat vechiles, which mounts a 105MM gun as the primary weapon.

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MIL-T-62222(AT)

g. The boresight knob (excluding boresight knob backlash) of each sighting instrument shall be used, if necessary, to reposition their reticles on the original aiming point. Any loss of boresight retention shall be noted by the new boresight knob position and shall not exceed the limits specified.

4.6.17.3.6.2 Rangefinder calibration.

4.6.17.3.6.2.1 Rangefinder settings. To determine conformance to 3.5.3.6.2.1, the rangefinder shall be mounted on a Government approved final inspection fixture and checked prior to installation in the turret.

4.6.17.3.6.2.2 Final rangefinder calibration settings. To determine conformance to

3.5.3.6.2.2, the rangefinder mounted in the turret and the turret installed on the vehicle, rangefinder calibration shall be checked in accordance with the following procedure:

a. A clearly defined target shall be provided between 1000 and 2000 meters located within an accuracy of 1/3 of 1 percent and the range scale set to agree with the range chosen.

b. Set the occluder knob to its midposition.

c. With the eyepiece in proper focus for the observer, coincidence shall be established with the target by means of the horizontal and vertical calibrating knob.

d. The calibrating reticle shall be illuminated. The calibrating reticle lamp shall not be left on for more than one minute at any one time. If it is necessary to turn on the reticle lamps again, allow at least two minutes off after the third check. Alignment of the coincidence reticle shall be established (see figure 3) using the cover protected ICS and halving knobs.

e. The horizontal, vertical, and ICS knob setting shall be that specified.

4.6.17.3.6.3 Superelevation. To determine conformance to 3.5.3.6.3, the superelevation of the gun sighting system shall be checked in accordance with the following procedures and observed for accuracy of sighting:

a. With the ballistic computer switch at the rangefinder turned off, the computer range correction knob and superelevation counter shall be set at zero.

b. If a mil scale on a target is to be used to read gun superelevation, the gun shall be aligned with the horizontal gun aiming point by laying low to high. The mil scale shall be fixed to the target with the zero index at the horizontal gun aiming point. If the gunner's quadrant M1Al is to be used to measure gun superelevation, the gun shall be leveled by means of a M1Al gunner's quadrant positioned on the breech ring pads.