Garmin G1000 Mooney M20TN - Manual (Page 309)

190-00647-00 Rev. A Garmin G1000 Pilot’s Guide for the Mooney M20M/M20R/M20TN 7-9
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 ten feet) as the Altitude Reference). The flight director’s Altitude Reference is
shown in the AFCS Status Box and 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 armed automatically when the flight director is in Pitch Hold, Vertical Speed, Flight
Level Change, or Go Around Mode. This armed mode is indicated by a white ‘ALT’ annunciation in the AFCS
Status Box. When armed, the flight director commands a constant acceleration maneuver to capture and
level off at the Selected Altitude. When the flight director starts the altitude capture, it transitions to Altitude
Hold Mode and holds the Selected Altitude; in this case, the Altitude Reference corresponds to the Selected
Altitude. The white ‘ALT’ annunciation moves to the active pitch mode field and flashes green for up to ten
seconds to indicate transition to Altitude Hold Mode.
C
HANGING THE
A
LTITUDE
R
EFERENCE
NOTE: Turning the ALT 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.
If the Selected Altitude is captured 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 captured.
Figure 7-6 Altitude Hold Mode
Altitude Hold
Mode Active
Flight Director
Altitude Reference
Selected Altitude
Selected Altitude Bug
Command Bars
Hold Pitch Attitude
to Maintain Altitude
Reference