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|  MIL-T-60382(MU)
3.4.3 Vibration. - The telescope shall be vibrated in a vertical
plane at a constant frequency of thirty cycles per second with an amplitude
of 1/16 inch (1/8 inch total excursion) for a period of five minutes plus
or minus fifteen seconds. Subsequent to vibration there shall be no
evidence of physical failure.
3.5 Cleanliness. - The telescope shall meet the cleanliness require-
ments of MIL-O-13830 and there shall be no more than 2 particles of dirt
visible on the reticle. The area of each Particle shall not be in excess
of the areas equivalent to a size 10 dig. There shall be no dirt on other
surfaces which interferes with observation or adversely affects image
quality.
3.6 Sealing.
3.6.1 The optical assembly portion. - The optical assembly portion of
the telescope shall be capable of sustaining an internal pressure of 5.0
0.1 pounds per square inch gage (psig), with less than 0.2 psig loss,
for a minimum period of two hours.
3.6.2 Counterbox assembly portion. - The counterbox assembly
portion of the telescope shall be capable of sustaining an internal
pressure of 2.0 0.2 psig, with less than 0.2 psig loss, for a minimum
period of two hours.
3.7 Accuracy.
3.7.1 Collimation. - With the flat mounting surface of the telescope
in a horizontal plane the azimuth counter reading 3200 mils the reset
counter shall read 3200 mils when the left (L) and right(R) gunner's aid
counters are set at 00 and 00. The eyepiece elbow shall be positioned in
detent and shall be perpendicular to the plane of the telescope locating
keyways. With the head cover open, the forward line of sight shall be to
the left of the eyepiece elbow and shall be parallel to the plane of the
telescope locating keyways and horizontal to the seating surface.
3.7.1.1 Open sight. - With the telescope positioned as in 3.7.1,
the line of sight of the open sight shall be horizontal within plus or
minus 10 mils and parallel in deflection (azimuth) to the optical lines
of sight within plus or minus 10 mils.
3.7.1.2 Eyepiece elbow movement. - Movement of the eyepiece elbow
from its midpoint to the left and right extremes of travel shall not cause
a deviation in excess of one degree.
3.7.2 Image tilt. - The image of a vertical target line shall be
vertical within one degree throughout one revolution of the head.
3.7.2.1 Image wander. - The wander of the reticle image measured at
the eyepiece shall not exceed 4 degrees in diameter for 2 full revolutions
3
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