M2/M3 BFV: TROUBLESHOOTING - OD1610 - LESSON 2/TASK 1
(f) 25mm Gun Guard. A metal guard to the rear of the 25mm rotor
prevents the weapon from hitting crew members during stabilized turret
operation. During gun failure, the metal guard does not protect from toxic
fumes or a blast and fragments.
(2) Weapons.
(a) TOW Missile System.
The TOW missile system has four major
parts.
They are the integrated sight unit (ISU), command guidance
electronics (CGE), power control unit (PCU), and TOW launcher.
1 Integrated Sight Unit (ISU).
The ISU has a telescopic
sight for day vision and a sight for night vision. It provides a picture
for the gunner.
Through the TOW tracker, the ISU corrects the missile
flight's trajectory by sending pitch and yaw signals.
These signals
indicate the line of sight to the target.
2 Command Guidance Electronics (CGE). The CGE gives signals
to the TOW missile system. These guidance interfaces and commands activate
the missile before it is launched and guide the missile during its flight.
Also, they terminate the missile's flight. All of these events occur when
the gunner presses the trigger to fire the missile. A timer controls events
during, before, and after launch.
3 Power Control Unit (PCU).
The PCU connects and supplies
various kinds of dc and ac voltage. This voltage is supplied to the ISU,
CGE, and other fire control parts. The PCU circuitry includes overvoltage,
undervoltage, and overcurrent protection.
It also has built in tests for
the various types of power.
4 TOW Launcher. The TOW launcher holds two TOW missiles. An
elevation servo allows the TOW launcher to follow the ISU elevation of a
20 range. This allows the missile to fly close to the gunner's sight. In
the erected position, the launcher can be tilted. This allows missiles to
be loaded from the cargo hatch.
Armor protects the launcher and missile
from damage from small arms.
(b) 25mm Gun.
At its station, the 25mm gun can be installed or
removed in three parts.
The gun has both electrical and manual fire
control. The
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