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|  MIL-T-62222(AT)
4.6.17.3.4.4 Stability of operation. To determine conformance to 3.5.3.4.4, for the elevation
axis, the following test shall be performed with the turret level, turret electrical power OFF and
engine inoperative:
a. Using the gunner's telescope and manual elevation handle, align the main gun on a
target within degree of horizontal.
b. Install a magnetic base dial indicator with a minimum one inch range on the turret
roof and set it at a predetermined point on the gun breech.
c. Again, using the telescope and manual elevation handle, depress the gun at least
15 mils (without overloading the indicator) and then elevate the gun to the original
target (a) without overshoot.
d. Make an indicator reading within six seconds after arriving on target and again after a
one hour period.
e. Verify that the breech has not been moved more than 0.5 mil in the elevation axis.
4.6.17.3.4.4.1 Gun stability (105mm). To determine conformance to 3.5.3.4.4, the following
test shall be performed with the vehicle nose down on a 15 degree slope, the main gun horizontal
and 90 degrees to the vehicle front to rear axis, turret power switch ON and engine inoperative:
a. Using the gunner's telescope and manual elevation handle, align the main gun on a
target within 1 degree of horizontal.
b. Install a magnetic base dial indicator with a minimum one inch range on the turret
roof and set it at a predetermined point on the gun breech.
c. Install a similar indicator on the race ring and set it at a predetermined point on the
race ring gear.
d. Using the telescope and power control handle, depress and traverse the gun at least
15 mils off-target (without overloading either indicator) and then return the gun to the
original target (a) without overshoot.
e. Read both indicators within eight seconds after arriving on target and again after a
one hour period.
f. Verify that the gun has not moved more than 0.5 mil in elevation or traverse.
4.6.17.3.4.5 Traverse and elevation limits. To determine conformance to 3.5.3.4.5, the
elevation and depression limits of the main gun shall be measured for 360 degrees of traverse
using power and manual controls as follows:
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