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PROPELLER PITCH CONTROL SYSTEM
Lift fans and cushion vanes assembly.

Gas Turbine Systems Technician (Electrical) 2
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Figure 7-8.--Bow thruster turning vanes.
console and the in/out movement of the yoke. Pushing
the yoke in or pulling it out will send electrical signals
t o the electrohydraulic servo valve and actuator,
a l l o w i n g the operator to control the pitch of the
propellers. An indicator at the operator station provides
an indication of propeller pitch. Figure 7-3 shows the
physical location of the propeller pitch controls in the
operator station. Let's talk about some of these controls
and how they work.
Propeller Pitch Control Levers
The function of the propeller pitch control levers is
t o allow the operator to control the pitch of the
propellers. By controlling the pitch of the propellers, the
operator can control the speed and direction of the craft.
Figure 7-9 shows a detailed view of the propeller pitch
control levers. Each control lever has a detent stop at
Figure 7-9.--Propeller pitch control levers.
z e r o degrees of propeller pitch with adjustable
mechanical stops at both ends. The propellers are
adjustable from +40° to -30°.
7-7






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