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OUT-OF-TRIM INDICATIONS
The FGC continuously monitors all three axes of the autopilot when it is engaged. If a control surface is detected to be significantly out of trim, a CAS caution message is displayed. The amber CAS message identifies whether it is the aileron or elevator that is affected and in which direction the control surface is out of trim.
MASTER DISCONNECT SWITCH
The master disconnect switches are installed on the outboard horn of each control wheel. When the switches are pressed with the autopilot engaged, the PFD red flashing AP indication appears and the autopilot audio warning sounds for approx-imately 1 1/2 seconds.
If a system fault causes the autopilot to disengage, pressing either master disconnect switches will cancel the red flashing AP message and silence the aural warning.
AUTOPILOT AND YAW DAMPER DISCONNECT LEVER
Pressing the AP/YD DISC lever down disengages the autopilot and yaw damper simultaneously. With the autopilot en-gaged and the disconnect switch pressed down, a flashing red AP message appears on the PFD and the autopilot audio warning sounds for approximately 1 1/2 seconds.
A red line is visible on the top edge of the switch when the switch has been moved to the disengage position.
AUTOPILOT DISENGAGEMENT
When the autopilot is manually disengaged, the AP symbols on each PFD flash red and an aural warning sounds for approximately 1 1/2 seconds.
The autopilot can be manually disengaged by:
-Pressing either master disconnect push button on the control wheels
-Activating the stab trim switches on the control wheels
-Pressing the AP push button on the FGP
-Selecting the AP/YD DISC on the FGP
-Pressing either TOGA switch
-Pressing the YD push button
If a system fault causes the autopilot to automatically disengage, the pilot must press the control wheel master disconnect switch to cancel the red flashing AP message and silence the aural warning. If the autopilot warning sounds because the TOGA switch is selected, a second press of the TOGA switch clears the warnings.
The autopilot automatically disengages upon stall warning.
AUTOPILOT TAKEOFF CONFIGURATION WARNING
If a takeoff is attempted with the autopilot on, the takeoff configuration warning system presents an EICAS warning mes-sage and sounds an voice alert. The warning sounds when the thrust lever is advanced for takeoff.
YAW DAMPER
DESCRIPTION
The yaw damper provides automatic turn coordination and yaw oscillation damping. The yaw damper actuator is a mechan-ically limited linear actuator.
Yaw damping improves the aircraft’s stability by damping out oscillations in yaw. These oscillations, if not corrected leads to the phenomenon called dutch roll.
The turn coordination function helps the aircraft into and out of turns. The flight guidance computers (FGCs) provide sig-nals to operate the yaw damper actuators.
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