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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.
Periscope
Rangefinder
Telescope
Elevation
Deflection
Elevation
Deflection
Elevation
Deflection
+ 0.25 mils
+ 0.25 mils
+ 0.40 mils
+ 0.50 mils
+ 0.15 mils
+ 0.15 mils
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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