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steady indicating that the system is in the ‘operate’ mode.
• Note •
When the system is in the ‘operate’ mode, pressing the ALT
button will cause the system to extinguish the SEL
annunciator and display the baro corrected encoded altitude.
Pressing the ALT button again will return the display to the
selected altitude and the SEL annunciator will come on again.
5. Press altitude selector VS button and use altitude selector knob to
input the desired vertical speed in 100 FPM increments. Turn the
knob clockwise to increase vertical speed and CCW to decrease
vertical speed. Positive (+) vertical speed indicates climb and
negative (-) vertical speeds indicates descent. Any vertical speed
from ±1 (100 FPM) to ±16 (1600 FPM) is selectable.
• Note •
If an altitude is selected that requires an opposite vertical
speed from that selected, the system will automatically select
the correct sign (‘+’ for climb, ‘-‘for descent) and a vertical
speed of 500 FPM.
6. After takeoff, press the VS button and then press and hold the ALT
button to engage the autopilot VS mode and arm the autopilot
altitude hold mode to capture and hold the selected altitude. If the
ALR button is pressed, the system will provide alarms at 1000 feet
and 300 feet from the selected altitude. As the airplane’s altitude
nears the selected altitude, the system automatically reduces
vertical speed command in 100 FPM increments to provide a 300
FPM vertical speed at altitude capture. The system will make a
smooth transition to the selected altitude and hold the selected
altitude.
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Supplements SR22
BARO Selection
Upon initial start-up, the altitude selector enters BARO select
immediately after the self-test if it is receiving a valid altitude signal.
The setting can easily be entered at this time. At other times, it is
necessary to select the DTA entry and BARO modes in order to adjust
the BARO setting. After initial start-up, the Baro setting can be
changed at any time using the following procedure:
1. Press DTA button on altitude selector to enter the data entry
mode. ENT will be annunciated.
2. Press BAR button to display the BARO setting. Repeated presses
of the BAR button will toggle the display between millibars and
inches Hg.
• Note •
The BARO setting can also be displayed by pressing the ALT
button while in the ‘operate mode’ (i.e. SEL annunciator
illuminated).
3. Rotate the selector knob (CW to increase setting or CCW to
decrease setting). Only three digits are displayed for millibars: for
a BARO setting of 952.8 mb, the display will indicate 952; and for a
BARO setting of 1003.8 mb, the display will read 003. For inches
Hg, the 1/100 decimal position will not be selectable or displayed;
for example, a 29.92 inch Hg setting is input and displayed as
29.9.
4. Press DTA again to accept the entry.
Set Decision Height (DH)
1. Press altitude selector DTA button to enter the data entry (ENT)
mode.
2. Press DH button to enter decision height with the display reading
0.0. Use the altitude selector knob to set the desired decision
height to the nearest 100 ft above the desired decision height. For
example, for a DH of 1160 feet, set 1200 feet.
3. Press altitude DTA button again to enter the selected DH. The
display will show the selected decision height for approximately 5
seconds and then revert to ALT mode and display the altitude. The
DH annunciator will remain illuminated indicating a decision height
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Cirrus Design Section 9
SR22 Supplements
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.
• Note •
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.
Set Altitude Alert (ALR)
1. Press altitude selector ALR button to arm alert mode. The ALR
annunciator will come on. 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
　
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