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|  MIL-P-48619(AR)
4.6.6.3 Dayliqht viewing area.
4.6.6.3.1 Elevation knob travel. -Establish coincidence of the
periscope reticle boresight cross and the projected target image
crosslines by means of the boresight knobss While observing the
boresight cross (intersecting point), rotate the elevation knob in
the clockwise direction. The boresight cross shall travel as
specified in 3.8.3.1.1a as measured on the target. Re-establish
coincidence of the reticle boresight cross and the projected target
image crosslines by means of the boresight knobs. While observing
the boresight cross, rotate the elevation knob in the counter-
clockwise direction. The boresight cross shall travel as specified
in 3.8.3.1.1a as measured on the target.
4.6.6.3.2 Deflection knob travel. -Perform this test utilizing
the procedure in 4.6.6.3.1, except the deflection knob shall be
rotated in the clockwise and counterclockwise direction. Boresight
cross (intersecting point) travel shall meet the requirements
specified in 3.8.3.1.1b as measured on the target.
4.6.6.3.3 Line of sight variation. -Establish coincidence of the
periscope reticle boresight cross and the projected target image
crosslines by means of the boresight knobs. While observing the
intersecting point of the reticle boresight cross, rotate the
deflection knob to its clockwise stop. During this rotation of the
deflection knob, any variation in elevation in the line of sight
through the periscope reticle boresight cross, shall not exceed the
values specified in 3.8.3.1.1c. Re-establish coincidence of the
periscope reticle boresight cross and the projected target image
crosslines by means of the boresight knobs. While observing the
intersecting point of the periscope reticle boresight crossl rotate
the deflection knob to its counterclockwise stop. During this
rotation of the deflection knob, any variation in elevation in the
line of sight through the periscope reticle boresight cross shall
not exceed the values specified in 3.8.3.1.1c to determine overall
conformance with the requirements specified therein.
4.6.6.4 Passive viewing area.
4.6.6.4.1 Elevation knob travel. -Establish coincidence of the
periscope reticle boresight cross and the projected target image
crosslines by means of the boresight knobs. While observing the
boresight cross (intersecting point), rotate the elevation knob in
the clockwise direction. The boresight cross shall travel as
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