Garmin G1000 PDAs & Smartphones User Manual


 
190-00498-07 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
459
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICES INDEX
7.5 AUTOPILOT OPERATION
NOTE: Refer to the POH for specific instructions regarding emergency procedures.
Theautopilotoperatesightcontrolsurfaceservostoprovideautomaticightcontrol.Pitchandrollcommands
are provided to the servos,basedontheactiveightdirectormodes.Theautopilotusespitchandrollratesto
stabilizetheaircraftattitudeduringupsetsandight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slip-
clutches 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ightdirector(ifnotalreadyengaged)areactivated.Engagement
isindicatedbyagreen‘AP’annunciationinthecenteroftheAFCSStatusBox.Theightdirectorengagesin
PitchandRollHoldmodeswheninitiallyactivated.
Figure 7-26 Autopilot Engaged
Autopilot
Engaged