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)

3.5.3.6.2 Rangefinder calibration.

3.5.3.6.2.1 Rangefinder settings. Each rangefinder shall be checked within 72 hours prior to installation in the turret. With the range scale set to 1200 meters, the calibration reticles positioned in accordance with figure 3, the 1200 meter target image in coincidence, and the rangefinder temperature stabilized at 80°F, plus or minus 20°F, the following requirements shall be met (see 4.6.17.3.6.2.1).

NOTE: Rangefinder temperature shall be considered stabilized after four hours at any given temperature plus or minus 5°F within the 60 to l00°F range.

a. Horizontal calibration knob. The setting of the horizontal calibration knob shall be within 40 units of error (UOE) of the midpoint of total travel.

b. Vertical calibration knob. The setting of the vertical calibration knob shall be within

180 degrees of midpoint of total travel.

c. Internal correction scale knob. The setting of the internal correction scale (ICS) knob shall be within 13 UOE of the mid-position "(25)".

3.5.3.6.2.2 Final rangefinder calibration settings. With the rangefinder installed in turret and turret installed on vehicle, the rangefinder settings shall be checked to a maximum range target

of 1000 to 2000 meters (see 4.6.17.3.6.2.2).

a. Horizontal calibration knob. The setting of the horizontal calibration knob shall be within 80 UOE (graduations) of the midpoint of total travel.

b. Vertical calibration knob. The setting of the vertical calibration knob shall be within

360 degrees of midpoint of total travel.

c. ICS knob. The setting of the ICS knob shall be within 20 UOE by the midpositions

"(25)".

3.5.3.6.3 Superelevation. The superelevation as measured at the gun shall meet the requirements of table VIII with the tolerances specified in table IX when data is transmitted automatically by positioning the rangefinder range scale at any specific range. The mil output as a result of the rotation of the ballistic output shaft shall be as specified in table IX

(see 4.6.17.3.6.3).

3.5.3.6.4 Indirect fire control.

3.5.3.6.4.1 Elevation quadrant. At zero gun elevation and with the bubble centered in the level vial, the knob scale and the index scale shall be adjusted to read zero. The reading on the elevation quadrant shall correspond to the position of the gun within plus or minus 1 mil at all angles of elevation and depression (see 4.6.17.3.6.4.1).