Garmin Flight Deck 100 User Manual

190-00728-04  Rev. A

®

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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 flight 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.

Pitch and roll commands are provided to the servos based on the active flight 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).

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.

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.

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.

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.