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Page Title:
Gun stability, nonstabilized mode |
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|  MIL-T-45379D(AT)
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 6 seconds after arriving on target and again after a
one-hour period.
e. Verify that the breech has not moved more than 0.5 mil in the elevation axis.
4.6.4.9.3.6.1.1 Gun stability, nonstabilized mode. To determine conformance to 3.5.9.3.6.1,
the following test shall be performed with the vehicle nose down on a 15 slope, the main gun
horizontal and 90 to the vehicle front to rear axis, turret power switch ON and engine
inoperative:
a. Using the gunner's telescope and manual elevation handle, aline the main gun on a
target within 1 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 8 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.
4.6.4.9.3.6.2 Stabilized mode. To determine conformance to 3.5.9.3.6.2, the vehicle shall be
placed on a 15 degree slope with the 105mm gun in the stabilized mode and the engine running.
The amount of drift shall be measured by noting movement of the periscope reticle on a clearly
defined target. When performing any stabilized mode tests, the drift controls shall be adjusted,
as specified, just prior to running the test.
4.6.4.9.3.7 Traverse and elevation limits. To determine conformance to 3.5.9.3.7, the
elevation and depression limits of the 105mm gun shall be measured for 360 of traverse using
power and manual controls as follows:
a. Power and manual controls, elevation/traverse switch ON:
1. Elevate the gun to 20, first with manual and then with power controls. With the
gun at 20 elevation, power traverse the turret for 360.
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