Garmin Flight Deck 100 User Manual

190-00728-04  Rev. A

®

479

Pressing the AP Key does not disengage the yaw damper.

Manual autopilot disengagement is indicated by a five-second flashing red ‘AP’ annunciation and an autopilot

disconnect aural alert, “Autopilot”. The autopilot is manually disengaged by pushing the AP Key on the AFCS 
Control Unit, the TO/GA Switch, or the AP DISC Switch (also disengages the yaw damper, if engaged). Pressing
the YD Key disengages the yaw damper independently of the autopilot. The ‘YD’ annunciation is removed upon
disengagement.

After  manual  disengagement,  the  autopilot  disconnect  aural  alert  and  flashing  ‘AP’  annunciation  may  be

cancelled by pushing the AP DISC Switch.

Automatic autopilot disengagement is indicated by a flashing red and white ‘AP’ annunciation and the autopilot

disconnect aural alert, which continue until acknowledged by pushing the AP DISC Switch.  Automatic 
autopilot disengagement occurs due to:

• System failure

• Invalid sensor data

• Stall warning (YD also disengages)

• Inability to compute default flight director modes

(FD also disengages automatically)

• Backup pitch trim channel selection

• Pushing the MEPT switches

Automatic yaw damper disengagement is indicated by a five-second flashing yellow ‘YD’ annunciation. The

yaw damper automatically disengages when autopilot disengagement is caused by failure in a parameter also 
affecting the yaw damper.  This means the yaw damper can remain operational in some cases where the autopilot 
automatically disengages.  A localized failure in the yaw damper system or invalid sensor data also cause yaw 
damper disengagement.