M2/M3 BFV: FIRE CONTROL SYSTEM - OD1608 - LESSON 1/TASK 4
CAUTION
20
Changes in the outside air temperature of
Fahrenheit (F) (11 centigrade) can cause
the
night sight to lose accuracy.
Boresight
the
night sight to day sight whenever the outside
air
temperature changes by 20F.
(1) Start the engines of two vehicles, and drive the two
vehicles to level ground.
Position the two vehicles facing each
other, no less than 656 feet (200 meters) apart.
Then stop the
engines of both vehicles.
(2) Turn the TURRET POWER switches in both vehicles ON.
(3) Turn ON the NIGHT VISION PWR switches (figure 28) in both
vehicles. Remember, after the NIGHT VISION PWR switch is turned ON,
the night vision assembly needs 10 minutes to cool down before
operation.
FIGURE 28.
THE NIGHT VISION POWER SWITCH.
35
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