Garmin G1000 Pilot’s Guide for the Socata TBM 850/900 190-00709-05 Rev. D510AUTOMATIC FLIGHT CONTROL SYSTEMALTITUDE HOLD MODE (ALT)Altitude Hold Mode can be activated by pressing the ALT Key; the flight director maintains the current aircraftaltitude (to the nearest 10 feet) as the Altitude Reference. The flight director’s Altitude Reference, shown in theAFCS Status Box, is independent of the Selected Altitude, displayed above the Altimeter. Altitude Hold Modeactive 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 (seeFigure 7-7). Selected Altitude Capture Mode automatically transitions to Altitude Hold Mode when the altitudeerror 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 theflight 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 CWSButton is released at the desired altitude, the new altitude is established as the Altitude Reference.Figure 7-8 Altitude Hold ModeSelectedAltitudeSelectedAltitudeBugCommand Bars Hold Pitch Attitudeto Maintain Altitude ReferenceAltitude HoldMode Active AltitudeReference
