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|  MIL-T-45379D(AT)
b. The boresight knobs of the periscope shall be adjusted to autocollimate the periscope
on the mirror of the synchronization fixture and the boresight knob positions shall be
recorded.
c. Approximate zero gun position shall be established, laying from high to low.
d. The boresight knobs shall be moved, if necessary, to superimpose the periscope
reticle on its reflected image from the mirror of the synchronization fixture.
Boresight knob movement from the positions established in b. above shall not exceed
the backlash limits established in 3.5.9.8.2.
e. Backlash shall be checked at gun positions of approximately 0, 15, 30, and 50
elevation and 10 depression.
4.6.4.9.8.3 Boresight knob travel. To determine conformance to 3.5.9.8.3, boresight knob
travel shall be tested after synchronization tests have been met. Tests shall be performed
according to the following procedure:
a. With the periscope removed from its mount, the synchronization fixture shall be
removed from the telescope adaptor and a telescope shall be inserted in the telescope
adaptor.
b. The telescope shall be alined on the 105mm gun target of 4.6.4.9.5, laying from low
to high without overtravel.
NOTE: The machine gun centerline shall not be disturbed for the remainder of boresight
knob travel inspection steps.
c. The telescope shall be removed from its adaptor.
d. The periscope shall be reinstalled.
e. The boresight knobs shall be adjusted to superimpose the periscope reticle on the
target in b. above. Boresight knob travel from this position shall be as specified in
3.5.9.8.3.
f. The cupola boresight knobs (excluding boresight knob backlash) shall be used if
necessary to reposition the commander's periscope reticle on its original aiming
point. Any loss of boresight retention shall be noted by the new boresight knob
position and shall not exceed the limits specified.
4.6.4.9.8.4 Boresight retention. To determine conformance to 3.5.9.8.4, boresight retention
of the commander's periscope line of sight with respect to the cupola machine gun shall be tested
in accordance with the following procedure:
a. Prior to the 8-mile road test, the vehicle shall be positioned at least 1000 m from a
clearly defined target.
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