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|  MIL-T-46386A(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 and the telescope shall meet the requirements of 3.5
to 3.12 inclusive.
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 Pressure (optical assembly). - The interior atmosphere of the
optical assembly shall be capable of withstanding an internal pressure of
5 0.10 pounds per Square inch gage (psig) for a period of 5 minutes with
no evidence of leakage.
3.6.2 Pressure (counterbox). - The counterbox shall be capable of with-
standing 2.0 + 0.20 psig for a period of 3 minutes with nO evidence of
leakage.
3.7 Accuracy.
3.7.1 Collimation. - With the flat mounting surface of the telescope
in ahorizontal 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 horizontal and parallel to the plane of the
telescope locating keyways.
3.7.1.1 Head cover closed. - With the telescope positioned as in 3.7.1,
the head cover in the closed position, the line of sight shall be horizontal
through the hole in the cover and shall be coincident with the geometric
axis of the reticle.
3.7.1.2 Lighr projector. - With the telescope positioned as in 3.7.1$
the light projector lamp energized, the vertical slit in the head of the
telescope shall be illuminated and shall be clearly visible over its entire
length and width at a target point from a distance of 80 meters.
3
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