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|  MIL-T-62222(AT)
3. The gun shall depress 5 degrees manually on each side of the vehicle in the areas
forward of the rear 28 degree lines to an angle 95 degrees forward of the vehicle
rear centerline without striking any portion of the vehicle.
4.6.17.3.4.6 Override control. To determine conformance to 3.5.3.4.6, the commander's
override control shall be operated and the control and movement of the gun shall be observed for
performance as specified. With the commander's and gunner's controls in the neutral position,
testing for no gun movement while depressing or releasing the override switch in the
commander's control shall be accomplished by observing no apparent movement of the gunner's
telescope reticle superimposed on a clearly defined target.
4.6.17.3.4.7 Hydraulic pressure limit switch. To determine conformance to 3.5.3.4.7, the
turret shall be traversed as specified and the system pressure gage observed for specific pressure
as the power pack motor comes on. With the power pack motor running and the controls in their
neutral position, the power pack shall cut out at the specified system pressure.
4.6.17.3.4.8 Turret traverse brake. To determine conformance to 3.5.3.4.8, the turret shall be
placed in a level position and the turret azimuth noted on the azimuth indicator. With the
gunner's power switch on, the gunner's control handle shall be turned to its stop in a clockwise
direction without actuating the palm switch. The azimuth indicator shall be observed for turret
movement. The procedure shall be repeated in the counterclockwise direction. The turret shall
then be power traversed in at least 10 degrees to the left with the gunner's controls, stopped, the
position observed on the azimuth indicator and the gunner's control handle again turned to its
right and then left stops without depressing the palm switch. The procedure shall be repeated
after power traverse to the right. The azimuth indicator shall show no movement of the turret
during any of these checks.
4.6.17.3.4.9 Travel locks. To determine conformance to 3.5.3.4.9, tests shall be conducted
as follows:
a. Turret slippage tests shall be conducted with the turret lock disengaged and with the
main gun in a forward position. The vehicle shall then be operated on a smooth,
hard-surfaced road in low gear at a speed of 5 mph and given a full-left, 90 degree
steer. Turret slippage shall be measured with the azimuth indicator. The pivot steer
tests shall be repeated in full-right, 90 degree steer.
b. For elevation or depression slippage tests, the main gun shall be elevated three to
eight degrees in a forward position. The vehicle shall be driven on a straight course,
hard-surfaced road at 20 mph, stopped as specified, and the gun slippage measured
with the M1A1 gunner's quadrant.
c. The hand traverse crank and the hand elevation crank shall be checked during road
tests and during power operation of the turret for movement as specified.
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