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VS is engaged, the autopilot compares the selected vertical speed
signal with the existing vertical speed derived from the autopilot’s
altitude transducer and maneuvers the airplane to attain the selected
vertical speed. The Vertical Speed (VS) select portion of the altitude
selector / alerter is showing a selected vertical speed (VS annunciator
on) and the autopilot Vertical speed (VS) mode is engaged.
The altitude selector / alerter also provides Decision Height (DH) and
Altitude Alert (ALR) selection. All selector function selection is made
through the altitude selector/alerter. Available functions are as follows:
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Section 9 Cirrus Design
Supplements SR20
DTA (Data) – The data entry button is used to select data entry mode.
The first time the DTA button is pressed the selector will enter the data
entry mode, the ENT annunciator will come on, and the SEL
annunciator will flash to indicate the system is ready to accept an
altitude entry. To change baro (BAR) correction, Decision Height (DH),
or Vertical Speed (VS), press the appropriate button on the selector
and rotate the input knob at the right of the display CW to increase the
displayed numbers and CCW to decrease the displayed numbers. Pull
the knob out and rotate as required to change the decimal numbers.
When the system is in the ENT mode, it is not coupled to the autopilot.
In this mode, the autopilot will hold the last vertical speed selected.
• Note •
It is not necessary to enter the DTA mode to change the
vertical speed, if vertical speed is coupled to the autopilot. If
this is the case, vertical speed changes can be made by
rotating the input knob as required to obtain the new vertical
speed.
While in this mode, pressing DTA a second time will toggle the system
to ‘operate’ mode. Repeatedly pressing the DTA button will toggle the
system between ENT and ‘operate’ mode.
BAR (baro) – In this mode, the baro setting used by the altitude
selector may be changed. When the Altitude Selector / Alerter is
initially powered, the BARO mode is displayed automatically at the
completion of the self-test. At other times, it is necessary to enter the
data entry mode by pressing the DTA button and then inputting a new
baro correction. Pressing the DTA button a second time will return the
system to the ‘operate’ mode.
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Cirrus Design Section 9
SR20 Supplements
ALT (Altitude) – The ALT button has two functions: Altitude Pre-select
and Altitude readout.
Pre-select - When the ALT button is pressed while the system is in the
Data Entry (DTA) mode the SEL annunciator will flash and a new
altitude can be selected by rotating the input knob CW to increase
altitude and CCW to decrease altitude in thousands of feet. Pull the
knob to input altitude in hundreds of feet. For example: 5500 feet is
input as 5.5. Pressing DTA again will return the system to ‘operate’
mode and the SEL annunciator will stop flashing with the ALT
annunciator remaining on. When a preselect altitude is coupled to the
autopilot by pressing and holding the VS button and then pressing the
ALT button, the airplane will fly at the selected vertical speed until the
selected altitude is intercepted. At that time the altitude selector will
command the autopilot to engage altitude hold.
Readout – When the ALT button is pressed in the ‘operate’ mode, the
SEL annunciator will go out and the display will show the baro
corrected encoder altitude. Repeated pushes of the ALT button will
alternately display baro corrected encoder altitude and pre-selected
altitude.
ALR (Alert Mode) – The ALR button enables the altitude alert system
in conjunction with the ALT SEL mode. Pressing the ALR switch
illuminates the ALR annunciator indicating arming of the alert mode.
Upon entering within 1000 feet of the altitude selected in ALT SEL, the
altitude alert chime will sound in the cabin speaker and headphones
and the ALR annunciator will flash. The chime will sound and the ALR
annunciator will flash again as the airplane approaches within 300 feet
of the selected altitude. If the airplane’s altitude deviates ± 300 feet
from the selected altitude, the chime will sound and the ALR
annunciator will flash to indicate the condition. The ALR function can
be alternately enabled and disabled by repeatedly pressing the ALR
button.
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Section 9 Cirrus Design
Supplements SR20
　
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