Garmin G1000 Pilot’s Guide for the Socata TBM 850/900
190-00709-05 Rev. D
510
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 flight director is in Selected Altitude Capture Mode (see
Figure 7-7). 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 flight director’s 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-flown 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 7-8 Altitude Hold Mode
Selected
Altitude
Selected
Altitude
Bug
Command Bars Hold Pitch Attitude
to Maintain Altitude Reference
Altitude Hold
Mode Active
Altitude
Reference
