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Rudder trim indications are displayed on the EICAS Status page and FLT CONTROL
synoptic page. On the ground, with the rudder trim in the neutral position, the trim indication
is green. In flight, the indication is white regardless of trim position.
REV 56, Jan 31/03
Vol. 1 11--30--4
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual MASTER
CSP A--013
Rudder Trim Control Panel and Rudder Mistrim Indicator <MST>
Figure 11---30---2
Switch must be rotated fully left
or fully right to activate trim.
NOTE
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
<0015>
10
10
R
Rudder Mistrim Indicator (yellow)
Indicates that the rudder is in a mistrim
condition, when the autopilot is engaged.
R
YD
Vol. 1 11--30--5
REV 56, Jan 31/03
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual
CSP A--013
MASTER
Two independent yaw damper systems operate continuously in flight to improve the aircraft
directional stability and turn coordination by damping out oscillations in yaw. The yaw
dampers are engaged by pushing the YD1 and YD2 switchlights on the YAW DAMPER
panel. Each yaw damper actuator automatically respond to inputs received from one flight
control computer (FCC). If a yaw damper failure occurs, it will be disconnected from the
FCC’s control. One yaw damper system must be engaged to engage the autopilot.
NOTE
During ground operations, power switching of theAPU
generator to IDG 2, and vice versa, will cause a
momentary power loss on DC Bus 2, which will
disengage Yaw Damper #2. To re--engage Yaw
Damper #2, wait 30 seconds (with the aircraft
stationary) before pressing the YD 2 switchlight.
REV 56, Jan 31/03
Vol. 1 11--30--6
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual MASTER
CSP A--013
Yaw Damper Controls and PFD Flag <MST>
Figure 11---30---3
Primary Flight Display
Pilot’s and Copilot’s Instrument Panels
<0015>
ENGAGE
Used to engage respective
yaw damper channel.
DISC
Used to disengage
yaw dampers
Yaw Damper Panel
Center Pedestal
YD (amber)
Indicates that both yaw dampers
have been disengaged.
10
AP
YD
10
YAW DAMPER
DISC ENGAGE
YD 1 YD 2
YD
Vol. 1 11--30--7
REV 56, Jan 31/03
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual
CSP A--013
MASTER
Rudder System --- EICAS Messages <MST>
Figure 11---30---4
Status Page
<0039>
<0039>
Primary Page
<0039> <0006>
YD 1 INOP status (white)
Comes on to indicate that channel YD 1 is
disengaged with channel YD 2 engaged.
YD 2 INOP status (white)
Comes on to indicate that channel YD 2 is
disengaged with channel YD 1 engaged.
CONFIG
TRIM
YAW DAMPER caution (amber)
Comes on to indicate that channel YD 1
and channel YD 2 are disengaged.
REV 56, Jan 31/03
Vol. 1 11--30--8
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual MASTER
CSP A--013
Rudder System --- Synoptic Page Indications <MST>
Figure 11---30---5
Rudder Position Indicator (white)
Indicates relative position of rudder.
Rudder Position Readout (white)
Numeric value represents position of
rudder in degrees.
FLT Control
Synoptic Page
Rudder Position Scale (white) <0005><0073>
Left tick mark represents 25 degrees, center tick mark
represents 0 degrees and right tick mark represents 25
degrees.
Rudder Position Scale (white)
Left tick mark represents 33 degrees, center tick mark
represents 0 degrees and right tick mark represents 33
degrees.
YAW DAMPER caution (amber)
Comes on to indicate that both
yaw dampers have failed.
YAW DAMPER 1/2 INOP
status (white)
Comes on to indicate that the
respective yaw damper has failed.
<0039>
<0039> 14
0
<0039>
14
<0039>
RUDDER
0
<0039>
<0039>
Vol. 1 11--30--9
REV 56, Jan 31/03
FLIGHT CONTROLS
Rudder
Flight Crew Operating Manual
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