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)

4.6.17.2.9 Vertical obstacles. To determine conformance to 3.5.2.9, the vehicle selected shall be driven forward at a speed not to exceed 5 mph without stalling over vertical obstacles as specified. The main gun shall be in the forward, fully elevated position. After the test, the vehicle shall be examined for damage.

4.6.17.3 Turret and cupola.

4.6.17.3.1 Main armament balance. To determine conformance to 3.5.3.1, verify that the main gun has been balanced in accordance with Drawing 12270442. The compensating weight is to remain attached to the gunner's guard when performing any gun control test without a coaxial machine gun and M457 dummy round. No simulated weights of any kind shall be used.

4.6.17.3.2 Nylon ballistic shield. To determine conformance to 3.5.3.2, the following tests shall be performed as follows:

a. Coaxial machine gun deflection. With the main gun on its zero aiming point, a simulated machine gun containing a centering aperture shall be installed in the machine gun mount. The mount shall be adjusted to boresight position while viewing the coaxial machine gun target through the centering hole in the simulated machine gun. A deflection measuring device shall be mounted to the gun shield and coaxial machine gun deflection shall be checked while elevating the main gun 19 degrees and depressing 8 degrees.

b. Gunner's telescope sighting system deflection. With the gunner's telescope set in its boresight position, deflection shall be tested by observing the gunner's telescope targets located at plus 15 degrees and minus 5 degrees on the target stand, as the main muzzle telescope reticle is superimposed on its appropriate targets.

4.6.17.3.3 System backlash. To determine conformance to 3.5.3.3, backlash tests shall be conducted as specified using the gunner's telescope to measure the amount of backlash.

4.6.17.3.4 Turret and gun control system. To determine conformance to 3.5.5.4, the vehicles shall be completely assembled, serviced with applicable fluids and lubricants, but need not be combat loaded. After tests, the vehicle shall be examined for leaks and workmanship

deficiencies possibly caused by operation. The turret and electrical system shall be as specified

during these tests.

4.6.17.3.4.1 Traverse and elevation rates.

4.6.17.3.4.1.1 Gun elevation speeds. To determine conformance to 3.5.3.4.1.1, tests shall be conducted to determine the elevation and depression controllability over the speed ranges specified. Tests shall be conducted with both the gunner's and commander's power handles.