Pilot's Guide

190-00663-02 Rev. B
Garmin G1000 Pilot’s Guide for the Hawker Beechcraft C90A/GT/GTi
409
AUTOMATIC FLIGHT CONTROL SYSTEM
ALTITUDE HOLD MODE (ALT)
AltitudeHoldModecanbeactivatedbypressingthe ALT Key; the flight director maintains the current aircraft
altitude (to the nearest 10 feet) as the Altitude Reference. The flight director’s Altitude Reference, shown in the
AFCSStatusBox,isindependentoftheSelectedAltitude,displayedabovetheAltimeter.AltitudeHoldMode
activeisindicatedbyagreen‘ALT’annunciationintheAFCSStatusBox.
AltitudeHoldModeisautomaticallyarmedwhentheightdirectorisinSelectedAltitudeCaptureMode
(see Figure 7-12).  Selected Altitude Capture Mode automatically transitions to Altitude Hold Mode when
thealtitudeerrorislessthan50feet.Inthiscase,theSelectedAltitudebecomestheightdirector’sAltitude
Reference.
CHANGING THE ALTITUDE REFERENCE
NOTE: Turning the ALT SEL Knob while in Altitude Hold Mode changes the Selected Altitude, but not the
flight director’s Altitude Reference, and does not cancel the mode.
Withthe CWS Buttondepressed,theaircraftcanbehand-owntoanewAltitudeReference.Whenthe
CWS Button is released at the desired altitude, the new altitude is established as the Altitude Reference.
Figure 7-13 Altitude Hold Mode
Selected
Altitude
Bug
Selected
Altitude
Altitude Hold
Mode Active
Altitude
Reference
Command Bars Hold Pitch Attitude
to Maintain Altitude Reference