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Gun laying on stationary target test |
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|  MIL-V-62008B(AT)
e. Read both indicators within 8 seconds after arriving on target and again after a
1 hour period.
f. Verify that the gun has not moved more than 0.5 mil in elevation or traverse.
4.5.1.40.13 Elevation and traverse limit tests. To determine conformance to 3.6.13.11,
the gun shall be operated in elevation, depression and traverse using power and manual controls
individually and the angles measured in each of the defined areas.
4.5.1.40.14 Gun laying on stationary target test. To determine conformance to 3.6.13.12
for acceptance testing, the gunsight reticle shall be brought within the borders of the target
specified for positions three and five with gunner power controls and position three with manual
controls. Two trials shall be made and the maximum time shall be used for final determination.
All positions shown on table III shall be used when performing CT's at the Government proving
grounds.
4.5.1.40.15 Operation on slope test. To determine conformance to 3.6.13.13 for
acceptance testing, the turret shall be placed on a 15 plus 2, minus -1 slope and the gunsight
reticle shall be brought within the borders of the target specified for positions three and five of
table III. One determination shall be made for each position and direction specified using gunner
power controls. Time limitation need not be met. All positions shown on table III shall be used
when performing CT's at the Government proving grounds.
4.5.1.40.16 Turret locking test. To determine conformance to 3.6.13.14 with turret lock
disengaged and the gun in forward position and elevated 3 to 8, the vehicle shall be operated
on smooth, level, hard-surfaced roads in low gear at speeds of 5 mph, then given a full steer 90
left turn and turret slippage noted on the azimuth indicator. This test shall be repeated with a full
steer 90 right turn. The vehicle shall be driven on a straight course over the break-in run track
at 20 mph, stopped as specified, and the gun slippage noted with the M1A1 gunner quadrant.
The hand traverse crank and hand elevation crank shall be observed for conformance to specified
requirements during the above tests.
4.5.l.40.17 Azimuth indicator test. To determine conformance to 3.6.16.2, the boresight
deflection knob scale of the gunner periscope shall be set at four. The turret shall be traversed in
a clockwise direction without over travel and vertical line of the gunner periscope reticle shall be
laid on a fixed well defined vertical aiming point. The zero of the gunner aid (outer movable
dial) on the azimuth indicator shall be positioned in line with the 1 mil pointer. The turret shall
be traversed approximately 50 mils clockwise and returned counterclockwise to zero without
over travel as read on the gunner azimuth indicator. The deflection boresight knob shall be
rotated until the vertical line of the gunner periscope reticle is realined with the original aiming
point. The difference between the original position and the final reading on the deflection
boresight knob scale is backlash error and shall not exceed 0.5 mils.
36
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