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4. Vertical speed can be adjusted by rotating the VS knob on the
programmer/computer. Clockwise rotation increases and
counterclockwise rotation decreases rate of climb (or descent) 100
FPM for each ‘click.’ The maximum adjustment is ±1600 FPM.
• Note •
A flashing VS mode annunciator indicates excessive error
between actual vertical speed and the selected vertical speed
(usually in climb). The pilot should adjust power or reduce the
commanded vertical speed as appropriate to remove the
error.
Altitude Pre-Select
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 altitude selector DTA button to enter the data entry (ENT)
mode.
2. Press altitude selector BARO button and adjust baro setting as
necessary.
3. Press the ALT button to enter altitude select mode. The SEL
annunciator will flash. Use the altitude selector knob to input the
desired altitude in thousands of feet; for example, 5500 feet is
entered as 5.5 and 10,500 is entered as 10.5.
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P/N 11934-S20 13 of 24
Cirrus Design Section 9
SR20 Supplements
4. Press DTA again to accept altitude entry, the ENT annunciator will
go out and the SEL annunciator will stop flashing and illuminate
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 and hold the VS button and then press 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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14 of 24 P/N 11934-S20
Section 9 Cirrus Design
Supplements SR20
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.
　
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