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|  MIL-Q-50385(Mu)
3.5 Sealing.- The quadrant shall show no evidence of water penetra-
tion within the counter area when subjected to Procedure I of the rain
test of MIL-F-13926.
3.6 Orientation.- The quadrant shall be adjusted to meet the qualifi-
cation procedures of Drawing F11730915 and positioned with the mounting
surface of the quadrant bracket in a vertical plane with the keyway of the
quadrant bracket horizontal. The elevation and correction counters shall
read zero. The elevation and crosslevel vial bubbles shall be centered
within the thickness of one graduation line on the vial and the gunner's
quadrant pads shall be level within 0.20 roil.
3.6.1 Telescope mounting tube.- The azimuth and elevation boresight
adjustments shall be actuated to position the geometric axis of the gimbal
tube horizontal and parallel to the vertical plane of the quadrant mounting
surface.
3.7 Accuracy.
3.7.1 Elevation counter.- With the quadrant positioned in accordance
with 3.6, utilizing the elevation knob, elevation counter readings shall
be obtained in 200 mil increments from 200 roils depression to 1200 roils
elevation. With the quadrant repositioned until the bubble in the eleva-
tion level is centered to within the thickness of one graduation line of
the vial, the angle of elevation formed by the gunner's quadrant pads shall
be equivalent to the elevation mil counter reading within 0.5 roil.
I
3.7.2 Crosslevel vial.- The crosslevel vial bubble shall remain
centered within 1/4 graduation when the elevation level vial is centered
and the quadrant positioned to the requirements of 3.7.1.
3.7.3 Correction counter.- Plus values of 25 roils and 50 roils put on
the correction counter shall subtract an equal number of roils within 0.2 mil
from the elevation counter. Minus values of 25 roils and 50 roils put on the
correction counter shall add an equal number of roils within 0.5 mil to the
elevation counter.
3.7.4 Crosslevel (cant).- From the horizontal position of 3.6 with
the mounting surface of the quadrant bracket vertical, rotation of the cross-
level knob shall provide a minimum travel of 34 degrees to the left and
34 degrees to the right.
3.7.5 Boresight adjustment.
3.7.5..1 Elevation adjustment.- The elevation boresight adjustment
shall move the geometric axis of the gimbal tube at least 18 roils above
and 18 roils below the position established in 3.6.1.
3.7.5.2 Azimuth adjustment.- The azimuth boresight adjustment shall
move the geometric axis of the gimbal tube at least 18 mils to the left and
18 roils to the right of the position established in 3.6.1.
3
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