M2/M3 BRADLEY FIGHTING VEHICLE: TURRET - OD1609 LESSON 1/TASK 1
e.
Coax Machinegun Access Doors.
Coax machinegun access doors give access to
the machinegun when it is mounted in the turret.
Foam rubber seals on the door
prevent toxic fumes from entering the turret.
The doors also provide protection
from ballistic fragments.
f.
25mm Gun Guard.
A metal guard to the rear of the 25mm gun prevents the
weapon from hitting crew members during stabilized turret operation.
However, in
case of gun failure, the metal guard does not offer protection from toxic fumes, or
from a blast and fragmentation.
g.
TOW Missile System.
The TOW missile system is tube launched, optically
tracked, and wire guided. The four major components of the TOW are the integrated
sight unit (ISU), the command guidance electronics (CGE), the power control unit
(PCU), and the TOW launcher. In addition, there are controls, displays, and logic
and power interfaces. Modular parts contribute to the maintenance of the ISU.
The ISU has a day vision telescopic sight and a night vision sight which gives a
television-type picture of the scene that is viewed. Through the TOW tracker, the
CGE continuously corrects the missile flight's trajectory by sending pitch and yaw
signals. These signals indicate the line-of-sight to the target.
The CGE gives signals to the TOW missile. These guidance interfaces and commands
activate the missile before it is launched and guide the missile during flight.
All of these events occur when the gunner presses the trigger to fire the missile.
The PCU connects and supplies various levels of direct current and alternating
current voltages.
These voltages are supplied to the ISU, CGE, and other fire
control components.
The PCU circuitry includes overvoltage, undervoltage, and
overcurrent protection, as well as a built-in test for the various types of power.
The TOW missile launcher holds two TOW missiles. It is located on the left side of
the turret. The launcher can be placed in either a retracted position to stow the
launcher, or an erected position before the missile is fired.
In the erected
position, the launcher is tilted so that
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