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|  MIL-T-50782(MU)
3.4 Sealing.
3.4.1 Pressure (optical system). - The entire interior area of
the optical assembly shall be capable of withstanding an internal
pressure of 5 0.10 pounds per square inch (psi) for a period of 5
minutes with no evidence of leakage.
3.4.2 Pressure (counterbox area). - Apply an internal, pressure
of 2.0 + .25 pounds per square inch (psi) of dry nitrogen for a
period of 3 minutes to each telescope. These shall be no evidence
of leakage.
3.5 Cleanliness.
3.5.1 Dirt. - Inspection for dirt and foreign particles (classed
as dirt) shall be made from the eye end only. The maximum size of
any particle appearing on the reticle shall be a reticle line width.
The maximum number of dirt particles appearing within a central field
of view of 50 mils diameter shall be three (3). The maximum number
of dirt particles appearing outside this field of view shall be three
(3). The minimum angular separation between dirt particles shall be
15 mils Dirt particles smaller than 1/4 reticle line width shall be
ignored regardless of distribution.
3.5.2 Other defects. - There shall be no evidence of moisture,
grease, fingerprints, condensates, fractures, and adhesive separations
when viewing through the objective and eye end of the instrument.
3.6 Orientation. - The requirements of 3.7 to 3.8,3.3.2 inclusive
shall be met with the telescope oriented in the following position:
(a) The main telescope tube vertical as determined by the
keys on each side.
(b) The reset and 6400 mil counters indicating 3200 mils
(c) The gunner's aid counters set at zero.
(d) The line of sight horizontal.
(e) The elbow assembly centered between the swing stops
within 2.
(f) Knob 8587442 indicating INDIRECT (out of detent).
3.7 Accuracy.
3.7.1 Collimation.
3.7.1.1 Pre-vibration. - Prior to meeting the requirements of
3.3.3, the line of sight shall be perpendicular to the locating key-
ways within 5.0 mils
3.7.1.2 Post-vibration. - Subsequent to meeting the requirements
of 3.3.3, the line of sight shall remain within 0.25 mil of the
azimuth position established in 3.7.1.1.
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