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)

a. Main gun shall be aligned with its horizontal aiming point by laying from low to high without overtravel.

b. The line of sight through the gunner's periscope (daylight) and the rangefinder shall be adjusted to superimpose their reticles on their aiming points.

c. The main gun shall be realigned with its aiming point laying from high to low.

d. The backlash or amount that each line of sight lags shall be measured by noting the new position of each reticle on its aiming point. Backlash for the periscope and the rangefinder shall not exceed the amount specified.

e. Backlash shall be checked at main gun positions of zero, plus 5,10, and 15 degrees.

4.6.17.3.6.1.3 Boresight knob travel. To determine conformance to 3.5.3.6.1.3, the boresight knob travel shall be tested after synchronization requirements have been met. The knob travel shall be measured from a position established with the gun line of sight on its horizontal aiming point laying from low to high and each reticle on its horizontal aiming point. Boresight knob travel shall be as specified.

4.6.17.3.6.1.4 Unity sight knob travel. To determine conformance to 3.5.3.6.1.4, place the unity reticle on its horizontal aiming point using the boresight knobs in conjunction with

4.6.17.3.6.1.3. From this position, rotate the elevation and deflection boresight knobs from stop

to stop and verify that the total travel is as specified.

4.6.17.3.6.1.5 Boresight retention. To determine conformance to 3.5.3.6.1.5, testing shall be conducted in accordance with the following procedure:

a. Prior to the eight mile road test, the vehicle shall be positioned at least 1200 meters from a clearly defined target.

b. With the computer set for 1200 meters, boresight mode of operation, the main gun shall be aligned on target laying from low to high.

c. The gunner's periscope reticle, the gunner's telescope reticle, and the rangefinder reticle shall be aligned on target. Boresight knob positions of the sighting instruments shall be recorded.

d. The eight mile road test shall be performed.

e. The vehicle shall be returned to position established in "a".

f. The main gun shall be aligned on original aiming point, laying from low to high.