Garmin Flight Deck 100 Marine Instruments User Manual


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190-00728-04 Rev. A
Embraer Prodigy
®
Flight Deck 100 Pilot’s Guide
477
AUTOMATIC FLIGHT CONTROL SYSTEM
7.5 AUTOPILOT AND YAW DAMPER OPERATION
NOTE: Refer to the Airplane Flight Manual (AFM) for specific instructions regarding emergency procedures.
The autopilot and yaw damper operate the flight control surface servos to provide automatic flight control. The
autopilotcontrolstheaircraftpitchandrollattitudesfollowingcommandsreceivedfromtheightdirector.Pitch
autotrimprovidestrimcommandstothepitchtrimactuatortorelieveanysustainedeffortrequiredbythepitch
servo.
TheyawdamperreducesDutchrolltendenciesandcoordinatesturns.Itcanoperateindependentlyofthe
autopilot and may be used during normal hand-flight maneuvers. Yaw rate commands are limited by the yaw
damper.
FLIGHT CONTROL
Pitchandrollcommandsareprovidedtotheservosbasedontheactiveightdirectormodes.Yawdamping
isprovidedbytheyawservo.Servomotorcontrollimitsthemaximumservospeedandtorque.Theservo
gearboxesareequippedwithslip-clutchesthatallowtheservostobeoverriddenincaseofanemergency(i.e.,
a failure event when the servo motor and slip clutch remain abnormally engaged).
PITCH AXIS AND TRIM
The autopilot pitch axis uses pitch rate to stabilize the aircraft pitch attitude during upsets and ight
director maneuvers. Flight director pitch commands are rate- and attitude-limited, combined with pitch
damper control, and sent to the pitch servo motor.
Whentheautopilotisengaged,theautomaticpitchtrim(APT)functioncommandsthepitchtrimactuator
to reduce the average pitch servo effort.
Manualelectricpitchtrim(MEPT)functionalityisavailableatanytimeviathepilotandcopilotMEPT
Switches.ManualtrimcommandsaregeneratedonlywhenbothhalvesoftheMEPT Switch are operated
simultaneously. Operating the MEPT Switches when the autopilot is engaged will cause the autopilot to
disconnect. 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 ight director
maneuvers. The flight director roll commands are rate- and attitude-limited, combined with roll damper
control, and sent to the roll servo motor.
YAW 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.
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