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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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P/N 13772-108 23 of 24
Cirrus Design Section 9
SR22 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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24 of 24 P/N 13772-108
Section 9 Cirrus Design
Supplements SR22
DH (Decision Height) – The DH button allows entry and arming of
altitude alerting at a set decision height. To set a DH, first enter the
data (DTA) entry (ENT) mode, press the DH button, and rotate the
selector knob to input the desired decision height to the nearest 100
feet above the specified decision height. For example, for a DH of
1160 feet set 1.2 (1200 feet). After setting the desired decision height,
press the DTA button again to accept the entered DH. The display will
show the selected DH for approximately 5 seconds and then revert to
Alt mode until the selected DH is reached during descent. The DH
annunciator will remain illuminated indicating a decision height is set.
As the airplane approaches within approximately 50 feet of the
decision height, the alert will sound and the DH light will flash. As the
airplane passes through approximately 50 feet beyond the decision
height, the alert will sound and the light will flash again. Pressing the
DH button again will disable the DH function causing the DH
annunciation to go out. Repeated activation of the DH button
alternately activates and deactivates the DH mode.
VS (Vertical Speed) – At initial start up, after self-test, pressing the
Altitude Selector / Alerter VS button enables vertical speed selector
mode. The initial vertical speed will be set at + 2 indicating a climb at
200 feet per minute. Rotating the selector input knob will change the
selected vertical speed in 100 FPM increments. Rotate CW to
increase vertical speed or CCW to Decrease vertical speed. The
maximum vertical speed is ± 1600 FPM (± 16). Zero vertical speed is
　
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