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|  MIL-T-50782(MU)
3.8.1.3 Side Play. - Reversing movement of the elevation knob at
zero elevation shall not cause the line of sight to shift more than
0.2 mil in azimuth.
3.8.2 Azimuth mechanism.
3.8.2.1 Azimuth error. - Error at l zimuth readings, taking in 800
mil increments through two full revolutions shall not exceee 1.0 mil
excluding backlash.
3.8.2.2 Deflection error. - Rotating the gunnner's l aid knob tO
indicate 15 mils followed by rotation of the azimuth knob in the
opposite direction (with backlash removed) to deflect the line of
sight 15 mils shall cause the reset counter to return to within 0.3
mil of the original setting. This requirement shall be met with the
15 mil value set into each scale and the azimuth counter indicating
3200, 4800 zero, and 1600 mils at the start of each reading .
3.8.2.3 Backlash. - Backlash in the azimuth mechanism shall not
exceed l.O mil when read on the azimuth counter; 1.5 mils when read
on the reset counter.
3.8.2.4 Level travel. - Starting with the line of sight in coin-
cidence with a horizontal target, the line of sight shall track the
target within 6.0 mils (total excursion) when rotated through two
full revolutions.
3.6.2.5 Lift. - Vertical displacement of the line of sight due
to reversing rotation by means of the azimuth knob shall not exceed
2 mils.
3.8.2.6 Five mil click lead mechanism. - positioning Knob 8587442
to indicate DIRECT shall cause a detent action to be felt when intro-
ducing 5.0 0.5 mil increment changes into the 6400 mil counter. This
requirement shall be met at standard and extreme operating temperatures.
3.8.3 Counter mechanism.
3.8.3.1 Rapid traverse. - The reset counter shall follow the azimuth
counter within 0.25 mil when the knob is rotated at 200 rpm for one
minute. The gunner's aid counters shall remain at zero.
3.8.3.2 Reset counter. - The reset counter shall be resettable to
3200 0.25 mils from any reading.
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