Figure 1-4. Daysight reticle and stadia lines.
(1) The passive, 4-power AN/TAS-5 nightsight has a 3.4-degree by 6.8-degree FOV. The nightsight is larger and heavier than the daysight. The nightsight converts heat emissions (infrared energy) from a target area into electrical signals, then to visible light (Figure 1-6, page 1-4). This enables the nightsight to display a real-time scene. Objects warmer than the ambient (surrounding) temperature appear in shades of red; cooler objects appear black. Like the daysight, the nightsight monitors the missile and sends commands to keep it on the gunner's line of sight.
(2) The firing mechanism, control system, and guidance system are the same as those on the daysight.
(3) The externally mounted 4.8-volt DC battery and coolant cartridge enable the nightsight to function without an external power source. If the appropriate accessory equipment is available, the nightsight can use military vehicle power.
(4) The nightsight has more controls and operates differently than the daysight.
(a) The ACTUATOR switch (Figure 1-7) turns the system on and off. This four-position switch allows the gunner to evaluate the operating condition of the nightsight. It is normally set to the OFF-LOCK position. Rotating the switch to the AIR-BATT-CHECK position allows the gunner to check the condition of the coolant cartridge and battery. If the indicator light is off and the coolant cartridge and battery conditioner are good, the gunner rotates the switch to the ON position to operate normally.
Use the fourth position, RELEASE, to release an expended coolant cartridge.
(b) The gunner uses the focusing ring to adjust the focus. The brightness (BRT) and contrast (CTRS) controls work the same as those on a television set (Figure 1-8, page 1-5).
c. Ammunition. The Dragon's ammunition is an expendable component consisting of both the missile and the launcher itself (Figure 1-9, page 1-6). The missile is installed in the launcher at the factory and is shipped ready to fire. The launcher serves as a storage and carrying case for the missile before it is launched. The Dragon has two types of missiles: the M223 practice round, which has an inert warhead, and the M222 HEAT round. The launcher consists of—
• A smooth-bored fiberglass tube.
• A breech and gas pressure generator assembly.
• Forward and rear shock absorbers.
• A sight battery, which provides power to operate the sight and fire the missile.
• A sight support bracket, which houses the Dragon's electrical connectors.
• A bipod, which supports the weapon system during dismounted firing.
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