Garmin G2000 Pilots Guide - Page 480
Autopilot Operation, Engaging the Autopilot
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SYSTEM OVERVIEW FLIGHT INSTRUMENTS EIS & CNS AUDIO PANEL Automatic Flight Control System 7.5 Autopilot Operation NOTE: Refer to the AFM for specific instructions regarding emergency procedures. The autopilot operates flight control surface servos to provide automatic flight control. Pitch and roll commands are provided to the servos, based on the active flight director modes. The autopilot uses pitch and roll rates to stabilize the aircraft attitude during upsets and flight director maneuvers. Flight director commands are rate- and attitude-limited, combined with pitch and roll damper control, and sent to the pitch and roll servo motors. Pitch autotrim provides trim commands to the pitch trim servo to relieve any sustained effort required by the pitch servo. 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 trim (MET). This allows the aircraft to be trimmed using a control wheel switch rather than the trim wheel. Manual trim commands are generated with the MET Switch. Trim speeds are scheduled with airspeed to provide more consistent response. Servo motor control limits the maximum servo speed and torque. The servo mounts are equipped with slipclutches set to certain values. This allows the servos to be overridden in case of an emergency. Engaging the Autopilot 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. When the AP Key is pressed, the autopilot and flight director (if not already engaged) are activated. Engagement is indicated by a green 'AP' annunciation in the center of the AFCS Status Box. The flight director engages in Pitch and Roll Hold modes when initially activated. Autopilot Engaged Figure 7-26 Autopilot Engaged AVOIDANCE MANAGEMENT FLIGHT HAZARD AFCS ADDITIONAL FEATURES APPENDICES INDEX 466 Garmin G2000 Pilot's Guide for the Cessna T240 190-01263-01 Rev. A
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