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mechanical inputs from the rudder pedals. Each hydraulic system powers one of the three
PCUs. Both pedal sets move simultaneously when operated from either the pilot or the
copilot station.
Rudder pedal centering and artificial feel is provided by a primary feel unit, located at the
right pedal pivot. A secondary feel unit, located in the aft fuselage, ensures that the rudder
remains centered in the event of a control disconnect.
In the event of a control jam, both pilot’s and copilot’s pedals will remain operable through
anti-jam mechanisms, however additional pedal force will be required to obtain rudder
deflection.
A rudder travel limiter assembly (RTL) is incorporated within PCU assembly to reduce rudder
travel. The RTL is automatically controlled, relative to airspeed and flap position, by the
spoiler and stabilizer control units (SSCUs). The SSCUs gradually reduce the rudder travel
from 33_ to 4_ (either side of neutral) as the aircraft speed increases. This will avoid
overstressing the fuselage at higher airspeeds and prevents the aircraft from entering a
severe sideslip.
The rudder trim is electrically operated and manually controlled using the trim selector on the
center pedestal. Operation of the rudder trim will not cause rudder pedal deflection.
Two independent yaw damper systems operate continuously in flight to improve the
airplane’s directional stability and turn coordination by damping out oscillations in yaw. Each
yaw damper actuator automatically respond to inputs received from one flight control
computer. One yaw damper system must be engaged to engage the autopilot.
Vol. 1 11--30--2
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Rudder System
Figure 11---30---1
RUDDER POWER
CONTROL UNITS
AFT
QUADRANT
RUDDER TRIM
ACTUATOR
SECONDARY
FEEL
MECHANISM
SUMMING
MECHANISM
YAW
DAMPER
PRIMARY
FEEL UNIT
COPILOT
PEDALS
RUDDER
TRAVEL
LIMITER
LOAD
LIMITER
PILOT
PEDALS
FORWARD
QUADRANT
&ANTI--JAM
MECHANISM
B
A
B
A
Vol. 1 11--30--3
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Rudder --- Flight Control Synoptic Page
Figure 11---30---2
Rudder Position Indicator (white)
Indicates relative position of rudder.
RUDDER
Rudder Limit Markers (white)
Displays rudder travel limits.
Turns amber if data is invalid.
Flight Controls Page
BRT
RUD LIMITER (amber)
Indicates loss of rudder limiter function.
Vol. 1 11--30--4
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Rudder Limiter --- EICAS Indications <1001>
Figure 11---30---3
RUD LIMITER RUD LIMITER caution (amber)
Indicates loss of rudder limiter function.
RUD LIMIT FAULT
RUD LIMIT FAULT status (white)
Indicates loss of redundancy in
rudder limiter.
Status Page
Primary Page
Vol. 1 11--30--5
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Rudder Trim Control Panel and Primary Flight Display Flag <1015>
Figure 11---30---4
RUD TRIM
Used to control rudder trim.
Spring loaded to centre position.
NL -- Increases rudder trim to nose left.
NR -- Increases rudder trim to nose right.
L
W
D
R
W
D
NL NR
AIL TRIM RUD TRIM
Aileron/ Rudder Trim Control Panel
Center Perdestal
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
Rudder Mistrim Indicator (yellow)
Indicates that the rudder is in a mistrim
condition, when the autopilot is engaged.
Vol. 1 11--30--6
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Rudder Trim --- EICAS Indications
Figure 11---30---5
Status Page
Rudder Trim Pointer (white)
Indicates trim actuator position.
Turns green when in neutral
position on the ground.
Rudder Trim Scale (white)
NL mark -- Rudder at
maximum left trim
NR mark -- Rudder at
maximum right trim.
NL NR
RUDDER
Flight Controls Page
Vol. 1 11--30--7
FLIGHT CONTROLS
Rudder REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Yaw Damper Controls and Primary Flight Display Flag <1015>
Figure 11---30---6
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
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