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|  MIL-V-62008B(AT)
4.5.1.42.6.2 Backlash. To determine conformance to 3.6.17.2, backlash shall be checked
after confirming that synchronization requirements have been met. Tests shall be made in
accordance with the following procedure:
a. Approximate 0 gun position shall be established laying from low to high.
b. The boresight knobs of the periscope shall be adjusted to autocollimate the
periscope on the mirror of the synchronization fixture. The boresight knob
position shall be recorded.
c. Approximate 0 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 positions established in "b" above,
shall not exceed the backlash limits established in 3.6.17.2.
e. Backlash shall be checked at gun positions of approximately 0, 15, 30, and
50 elevation and 10 depression.
4.5.1.42.6.3 Boresight knob travel. To determine conformance to 3.6.17.3, boresight
knob travel shall be tested after synchronization requirements 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 the telescope shall be inserted in
the telescope adaptor.
b.
The telescope shall be aligned with its collimator of the collimator fixture
laying from low to high without over travel.
NOTE: The machine gun centerline shall not be disturbed for remainder of
boresight knob travel inspection steps.
c.
The telescope shall be removed from its adaptor.
d.
One periscope body and one periscope head shall be installed in the
periscope mount.
e.
The boresight knobs shall be adjusted to superimpose the periscope reticle on
its collimator. Boresight knob travel from this position shall be as specified
in 3.6.17.3.
f.
The installed periscope body shall be replaced by the other periscope body
and step (e) above shall be repeated using the respective collimators for the
periscope body.
g.
Steps e and f above shall be repeated with the other periscope head in the
periscope mount.
4.5.1.43 Vehicle hydraulic control system tests.
4.5.1.43.1 Boom check. To determine conformance to 3.6.18.1 and 3.6.18.2 the boom
travel locks shall be disengaged. The winch cable shall be over the boom tip sheave and fastened
to the hook stowage eye. The winch gear shift shall be in low gear. To raise the boom from
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