ALT (Altitude Hold) Mode
When ALT is selected, the autopilot will hold the altitude at the time the
mode was selected. Altitude hold will not engage if an autopilot roll mode
is not engaged. Altitude correction for enroute barometric changes may be
made by rotating the VS/Modier knob on the autopilot computer. Clockwise
rotation will increase and counterclockwise rotation will decrease altitude
approximately 20 feet for each “click”. The maximum adjustment is ±360
feet. Adjustment greater than 360 feet can be made by selecting the VS
mode and ying the airplane to the new altitude and then reengaging AL
T
mode.
The G1000 altitude bug may be used to preselect an altitude for the autopilot
to level off at. The altitude can be above or below the current altitude and
the vertical speed selected through the autopilot should be appropriate for
the desired altitude change. Once the altitude is selected using the altitude
knobs on the G1000, the altitude and vertical speed can be coupled by the
autopilot by simultaneously pressing the ALT and VS buttons on the autopilot
computer.
ALT and VS will be displayed on the G1000 and the autopilot
computer. The
ALT annunciation is shown as white on the G1000 because
it is armed, but not active. The VS annunciation is shown as green on
the G1000 because it is active. When the autopilot captures the selected
altitude and levels off,
VS disappears and ALT will be shown as green
because it is now the active mode.
As the airplane nears the selected altitude, the system automatically reduces
vertical speed command in 100 FPM increments to provide a smooth and
slow transition to the selected altitude.
VS (Vertical Speed) Mode
When VS is selected, the autopilot will synchronize to and hold the vertical
speed at the time the mode was selected. Vertical Speed mode will not
engage if an autopilot roll mode is not engaged. The vertical speed selection
is displayed in 100 foot increments at the far right of the autopilot computer
display next to the VS annunciation. A plus (+) value indicates a climb and
a negative (-) value indicates a descent. The selected vertical speed can
be adjusted by rotating the VS/Modier knob on the autopilot computer.
Clockwise rotation increases and counterclockwise rotation decreases the
rate of climb or descent 100 FPM for each “click”. The maximum selectable
vertical speed is ±3000 FPM.
NOTE: If an altitude is selected that requires an opposite vertical
speed from that which is selected, the
VS annunciation will ash but the
airplane will follow the selected vertical speed and will not level off since
the selected vertical speed is taking the airplane away from the selected
altitude.
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