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Dual yaw dampers operate in an active/standby mode to provide continuous yaw damping in the
event of one failed yaw damping channel. The active/standby status will be switched each flight
leg.
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−11
RUDDER CONTROL (CONT'D)
Rudder Control System Operation (Cont’d)
Initial yaw damper engagement is controlled by flight guidance computer at IAC power up. In flight,
the pilot must select the YAW switch located on the guidance panel if reengagement
of the yaw
damping system is necessary.
The yaw damper authority, given neutral trim, provides a nominal value of 7.5 ° rudder left or right.
Yaw damper condition is continuously monitored and any fault detected is displayed on EICAS. To
ensure full motor performance in cold conditions, each actuator has a thermofoil heater which is
powered, controlled and monitored by the Heater Brake Monitor Unit (HBMU). For the damping
control systems characteristics, refer to the AFCS Chapter 4 of this manual.
The summing mechanism output is transmitted to a control rod to the Rudder Travel Limiter (RTL).
The RTL limits the rudder surface travel at high speeds and allows full rudder surface travel at low
speeds. The RTL output drives a torque tube which is connected (via load limiting bungees) to the
input lever of the associated hydraulic PCUs. There are three PCUs powering the rudder system.
Rudder Travel limiter
The RTL limits rudder authority as a function of Calibrated Airspeed (CAS) and flap position to
protect the deflection of the rudder surface beyond the structural capability of the vertical stabilizer,
while allowing for sufficient authority to control the airplane. The RTL also allows for full rudder
authority at high airspeed in the event of total loss of (FCU) control.
The position of the rudder is shown on EICAS Flight Control page (rudder trim position is shown
on Primary page). Left and right rudder indication is displayed by a pointer on the synoptic page.
GF1010_073
CAS
RTL: RUDDER ANGLE
0
0
20
40
200 400
25
Flaps DN 37
Flaps UP
155
2.3
After takeoff the amount of rudder travel will be limited as a function of flap retraction or airspeed
increasing above 155 knots.
FLIGHT CONTROLS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−12
RUDDER CONTROL (CONT'D)
Rudder Surface Position Indication
Left and right rudder surface position is displayed by a moving pointer on the EICAS FLIGHT
CONTROLS page. A single pointer indicates left and right rudder surface positions.
Scale Pointer
Filled rudder cross−section
directed toward the centre
of the scale. It will change
color, (green or amber)
based on hydraulic
pressure availability.
Scale
Arc represents the left and
right rudder travel paths.
Rudder Limit Bug
Indicates the position and
status of the rudder limiter.
Control active − bug
color is white.
Control inactive − bug
color is amber.
Invalid − bug is
removed.
GF1010_013
ELEV
RUDDER
ELEV
SCALE SHORT TICK MARK
Pointer right +35.5°
Pointer left −35.5°
at 0°
Rudder Trim
Rudder trim is available by rotating the RUD TRIM control switch on the trim control panel (centre
pedestal), in the desired direction. The control provides signals to a trim actuator that repositions
the rudder neutral point.
Hydraulic power is necessary to set rudder trim. Rudder trim position is displayed on PRIMARY
page, along with the allowable takeoff
green band.
A “CONFIG RUD TRIM” red warning message is accompanied by a “NO TAKEOFF”
aural
warning. It is displayed during the takeoff
roll if the rudder trim is set outside the allowable takeoff
range.
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−13
RUDDER CONTROL (CONT'D)
Rudder Trim (Cont’d)
NL RUDDER NR
Trim Scales
Rudder trim range for
nose left centre and nose
right indications.
− Nose left.
− Nose right.
Pointer
Moves horizontally along the
scale to indicate the trim setting.
Green Band
Replaces the centre tick mark.
White when not in the green
takeoff
position.
Rudder Trim Switch
Located on the trim control
panel (pedestal). Switch must
　
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