Pilot's Guide

Garmin G1000 Pilot’s Guide for the Beechcraft C90A/GT/GTi
190-00663-03 Rev. A
424
AUTOMATIC FLIGHT CONTROL SYSTEM
FLIGHT LEVEL CHANGE MODE (FLC)
NOTE: The Selected Altitude should be set before selecting Flight Level Change Mode.
Flight Level Change Mode is selected by pressing the FLC Key. This mode acquires and maintains the
Airspeed Reference (in IAS or Mach) while climbing or descending to the Selected Altitude (shown above
the Altimeter). When Flight Level Change Mode is active, the flight director continuously monitors Selected
Altitude, airspeed, Mach, and altitude.
The Airspeed Reference is set to the current airspeed upon mode activation. Flight Level Change Mode is
indicated by a green ‘FLC’ annunciation beside the Airspeed Reference in the AFCS Status Box. The Airspeed
Reference is also displayed directly above the Airspeed Indicator, along with a bug corresponding to the Airspeed
Reference along the tape.
Engine power must be adjusted to allow the autopilot to fly the aircraft at a pitch attitude corresponding
to the desired flight profile (climb or descent) while maintaining the Airspeed Reference. The flight director
maintains the current altitude until either engine power or the Airspeed Reference are adjusted and does not
allow the aircraft to climb or descend away from the Selected Altitude.
CHANGING THE AIRSPEED REFERENCE
The Airspeed Reference (shown in both the AFCS Status Box and above the Airspeed Indicator) may be
adjusted by:
• Using the NOSE UP/DN Wheel
• Pressing the CWS Button, hand-flying the aircraft to attain a new Airspeed Reference, then releasing the
CWS Button
NOTE: If the Selected Altitude is reached during CWS maneuvering, the Altitude Reference is not changed.
To adjust the Altitude Reference in this case, the CWS Button must be pressed again after the Selected
Altitude is reached.
During climb, the pilot must select the Airspeed Reference (IAS or Mach), automatic switching does not
occur. For descent, if Mach airspeed reference is selected (above 16,000 ft) the aircraft descends in Mach until
the Mach airspeed reference reaches 220 KIAS, at which point the airspeed reference automatically switches
to IAS. The system determines aircraft climb or descent by the relationship between the current and Selected
altitudes.
Airspeed Reference units can be manually toggled between IAS and Mach units using the SPD Key. When
the FLC Airspeed Reference is displayed in Mach, the Airspeed Reference Bug is displayed on the Airspeed
Indicator at the IAS corresponding to the selected Mach target speed and the current Mach number is shown
only in the AFCS Status Box.