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Pitch Axis and Trim
The autopilot pitch axis uses pitch rate to stabilize the aircraft pitch attitude during upsets and flight director maneuvers. Flight director pitch commands are rate- and attitude-limited, combined with pitch damper control, and sent to the pitch servo motor. The pitch servo measures the output effort (torque) and provides this signal to the pitch trim servo. The pitch trim servo commands the motor to reduce the average pitch servo effort.
When the autopilot is not engaged, the pitch trim servo may be used to provide manual electric pitch trim (MEPT). This allows the aircraft to be trimmed using a control wheel switch rather than the trim wheel. Manual trim commands are generated only when both halves of the MEPT Switch are operated simultaneously. Trim speeds are scheduled with airspeed to provide more consistent response.
Roll Axis
The autopilot roll axis uses roll rate to stabilize aircraft roll attitude during upsets and flight director maneuvers. The flight director roll commands are rate- and attitude-limited, combined with roll damper control, and sent to the roll servo motor.
Yawaw Axis
The yaw damper uses yaw rate and roll attitude to dampen the aircraft’s natural Dutch roll response. It also uses lateral acceleration to coordinate turns. Yaw damper operation is independent of autopilot engagement.
396 Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 190-00494-02 Rev. B
Automatic utomatic utomatic Flight Control System ystem
SYSTEM
OVERVIEW
FLIGHT
AUDIO PANEL EICAS INSTRUMENTS
& CNS
FLIGHT
MANAGEMENT
HAZARD
ADDITIONAL AFCS AVOIDANCE
INDEX APPENDICES FEATURES
Engagementngagement NOTE: Autopilot engagement/disengagement is not equivalent to servo engagement/disengagement. Use the CWS Button to disengage the pitch and roll servos while the autopilot remains active. Noteote: The autopilot cannot be engaged if the yaw damper has failed.
When the AP Key is pressed, the autopilot, yaw damper, and flight director (if not already active) are activated and the annunciator lights on the AFCS controller for the autopilot and yaw damper are illuminated. The flight director engages in Pitch and Roll Hold Modes when initially activated.
Figure 7-31 Autopilot and Yaw Damper EngagedAutopilot EngagedYaw Damper Engaged
When the YD Key is pressed, the system engages the yaw damper independently of the autopilot and the yaw damper annunciator light is illuminated.
Autopilot and yaw damper status are displayed in the center of the AFCS Status Box. Engagement is indicated by green ‘AP’ and ‘YD’ annunciations, respectively.
Control Wheel Steering
During autopilot operation, the aircraft may be hand-flown without disengaging the autopilot. Pressing and holding the CWS Button disengages the pitch and roll servos from the flight control surfaces and allows the aircraft to be hand-flown. At the same time, the flight director is synchronized to the aircraft attitude during the maneuver. CWS activity has no effect on yaw damper engagement.
The ‘AP’ annunciation is temporarily replaced by ‘CWS’ in white for the duration of CWS maneuvers.
Control Wheel SteeringFigure 7-32 CWS Annunciation
In most scenarios, releasing the CWS Button reengages the autopilot with a new reference. Refer to flight director mode descriptions for specific CWS behavior in each mode.
190-00494-02 Rev. B Garmin G1000 Pilot’s Guide for the Cessna Citation Mustang 397
Automatic utomatic utomatic Flight Control System ystem
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EICAS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
Disengagementisengagement
The autopilot is manually disengaged by pushing the AP Key on the AFCS Control Unit, the GA Switch, or the MEPT ARM Switch. Manual autopilot disengagement is indicated by a five-second flashing yellow ‘AP’ annunciation and a three-second autopilot disconnect aural alert.
Figure 7-33 Manual Autopilot Disengagement
Pushing the AP DISC Switch or YD Key disengages both the yaw damper and the autopilot. When the yaw damper and autopilot are manually disengaged, both the ‘AP’ and ‘YD’ annunciation turn yellow and flash for 5 seconds and a three-second autopilot disconnect aural alert is generated.
Figure 7-34 Yaw Damper Disengagement
After manual disengagement, the autopilot disconnect aural alert may be cancelled by pushing the MEPT ARM or AP DISC Switch (AP DISC Switch also cancels the flashing ‘AP’ annunciation).
Automatic autopilot disengagement is indicated by a flashing red and white ‘AP’ annunciation and by the autopilot disconnect aural alert, which continue until acknowledged by pushing the AP DISC or MEPT ARM Switch. Automatic autopilot disengagement occurs due to:
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Cessna Citation Mustang Pilot’Guide 2(40)
