MIL-T-45379 Tank, Combat, Full-Tracked, 105 Mm Gun, M60A3-TtsThis specification establishes the construction, performance and inspection requirements for M60A3 full-tracked combat tank equipped with a Tank Thermal Sight TTS.

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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.