FLIGHT CONTROLS
Volume 2
Flight Crew Operating Manual
Sep 13/2004
10-01-04
CSP 100-6
REV 1
PRIMARY FLIGHT CONTROLS (Cont)
RUDDER POWER CONTROL UNIT (PCU)
There are two hydraulic rudder PCUs attached to the rear spar of the vertical stabilizer. The left hydraulic system energizes
the upper rudder PCU and the right hydraulic system energizes the lower rudder PCU. If the right hydraulic system loses
pressure, the lower rudder PCU is powered by the auxiliary hydraulic system.
The rudder PCUs also give protection to the rudder control surface against gust loads while the aircraft is on the ground.
RUDDER TRAVEL LIMITER
The rudder travel limiter actuator puts a limit on the movement of the rudder control surface, as a function of airspeed. This
insures that the aerodynamic force on the rudder is not more than the structural limit of the vertical stabilizer. The horizon-
tal-stabilizer-trim electronic-control unit (HST ECU) controls the movement of the rudder travel limiter-actuator.
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