12 of 24 P/N 13772-140
Section 9 Cirrus Design
Supplements SR22 / SR22T
Altitude Pre-Select Function
The altitude selector may be used to set up an altitude and vertical
speed for intercept and capture. The altitude can be above or below
the current altitude and the vertical speed chosen should be
appropriate (climb or descent) for the altitude. Once selected, the
altitude and vertical speed can be coupled to the autopilot by pressing
and holding the VS button and then pressing the ALT button.
1. Press HDG, NAV, GPSS, APR, or REV to engage a roll mode. The
associated annunciations will illuminate.
2. Set the PFD Altitude Bug to the desired altitude.
3. Press and hold VS and simultaneously press ALT to engage the
vertical speed mode and arm the altitude hold mode.
4. ALT and VS annunciations will appear and the autopilot will attain
and hold the aircraft at the vertical speed at the rate of climb/
descent when engaged. Use the VS knob on the Programmer/
Computer for vertical speed adjustment.
As the aircraft approaches the target altitude, a reduction in the
vertical speed will automatically occur to ensure that there is no
adverse acceleration at the point of capture. Once the target
altitude has been captured, the VS annunciation will extinguish to
indicate engagement of the altitude hold (ALT) mode.
Prior to altitude capture, with the VS mode engaged and the ALT
mode armed, the PFD Vertical Speed Bug and/or PFD Altitude
Bug can be changed at any time, causing the autopilot to respond
accordingly.
During the pre-select sequence, with the VS mode engaged and
the ALT mode armed, the following are subject to occur:
• Pressing the ALT mode selector switch once will disengage the
VS mode, and engage the ALT mode. Consequently, the VS
annunciation will extinguish, the PFD Vertical Speed Bug will
disappear. This may cause some adverse acceleration, as the
autopilot works to hold the aircraft at the captured altitude.
• Pressing the VS mode selector switch once will disarm the ALT
mode, but leave the VS mode engaged. Consequently, the ALT
annunciation will extinguish.
Revision 01: 01-06-10
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