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)

3.5.9.5.1.6  Boresight retention.  The gunner's periscope (daylight and night channel), commander's rangefinder, and the telescope shall maintain previously established boresight within the values in table VIII (see 4.6.4.9.5.1.6).

TABLE VIII.  Boresight retention.

3.5.9.5.2  Laser rangefinder (LRF).

3.5.9.5.2.1  LRF system power turn on.  The LRF system power turn on is accomplished when the XM21 ballistics computer power switch is thrown to ON.  Power-on condition of the LRF is indicated by illumination of RESET and FEED switch lights, RANGE SELECTOR switch light, mode light and RANGE and RETURNS readouts.  System turn on shall also cause illumination of the commander's RANGE switch light.  The light begins flashing within

4 seconds to indicate the laser is armed and ready to fire when laser is in ON or AUTO mode.  A fixed range value of 1200 meters (m) (battle range) shall be automatically fed into the computer (see 4.6.4.9.5.2.1).

3.5.9.5.2.2  Mode control switch.  Operation of the mode control switch shall cause the LRF to operate in TEST, ON or AUTO mode and shall cause illumination of the corresponding control lamp (see 4.6.4.9.5.2.2).

3.5.9.5.2.3  RANGE switch.  With LRF power applied, the laser in either AUTO or ON mode and the RANGE switch flashing periodically, acutation of the RANGE switch shall cause the LRF to perform a ranging operation (see 4.6.4.9.5.2.3).

3.5.9.5.2.4  RESET switch.  With laser rangefinder power applied, actuation of the RESET

switch shall cause (see 4.6.4.9.5.2.4):

a.   The RANGE indicators to show zero.

b.   The RETURNS indicator to show zero.

c.   The GO and SELECT light to extinguish. d.   The LAST return indicator to illuminate.

e.   The RANGE switch light to flash periodically (with laser in ON or AUTO mode only).

f.    The laser will be armed (with laser in ON or AUTO mode only).

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