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3. Engage desired mode by pressing mode selector button on
autopilot programmer/computer.
Heading Mode
1. Begin by selecting a heading on HSI within 10° of the current
airplane heading.
2. Press HDG button on autopilot programmer/computer. The HDG
annunciator will illuminate and the airplane will turn to the selected
heading.
3. Use HSI HDG bug to make heading changes as desired.
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Section 9 Cirrus Design
Supplements SR20
Altitude Hold Mode
1. Manually fly the airplane to the desired altitude and level off.
• Note •
For smoothest transition to altitude hold, the airplane rate of
climb or descent should be less than 100 FPM when Altitude
Hold is selected.
2. Press HDG or NAV to engage a roll mode. The associated
annunciator will illuminate.
• Note •
A roll mode must be engaged prior to engaging a pitch mode.
3. Press the ALT button on the autopilot programmer/computer. The
ALT annunciator will illuminate indicating that the mode is
engaged and the autopilot will hold the present altitude.
• Note •
Manually flying the airplane off the selected altitude will not
disengage altitude hold and the autopilot will command a pitch
change to recapture the altitude when the control input is
released.
4. Altitude can be synchronized to another altitude by rotating the VS
knob on the programmer/computer. Clockwise rotation will
increase and counterclockwise rotation will decrease altitude 20
feet for each ‘click.’ The maximum adjustment is ±360 feet.
Adjustments greater than 360 feet can be made by selecting VS
mode and flying the airplane to the new altitude and then reengaging
ALT mode.
Vertical Speed Mode
1. Begin by manually establishing the desired vertical speed.
2. Press HDG or NAV to engage a roll mode. The associated
annunciator will illuminate.
• Note •
A roll mode must be engaged prior to engaging a pitch mode.
3. Press the VS button on the autopilot programmer/computer to
engage the vertical speed mode. When the mode is engaged, the
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Cirrus Design Section 9
SR20 Supplements
autopilot will synchronize to and hold the vertical speed at the time
the mode was engaged.
• Note •
The vertical speed is displayed in 100-foot increments on the
programmer/computer window or on the vertical speed
indicator on the PFD. A plus (+) value indicates climb and a
negative or minus (-) value indicates descent.
4. Vertical speed can be adjusted by rotating the VS knob on the
programmer/computer or the right knob on the PFD when the VSI
bug has been selected.
• 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.
GPS tracking and GPS Approach
1. Begin with a reliable GPS signal selected on the NAV receiver.
2. Select desired course on HSI and establish a desired intercept
heading.
3. Press the NAV button on the autopilot programmer/computer
twice. The NAV and GPSS mode annunciators will illuminate.
• Note •
If the course needle is at full-scale deviation, the autopilot will
establish the airplane on a heading for a 45° intercept with the
selected course. As the airplane approaches the course, the
autopilot will smoothly shallow the intercept angle. The pilot
may select an intercept angle less than the standard 45° by
setting the desired intercept heading with the HSI HDG bug,
pressing and holding HDG, and then pressing NAV once to
intercept course in NAV mode or twice to intercept course in
GPSS mode on the autopilot programmer/computer. When
the on-course intercept turn begins the HDG mode will
disengage and the annunciator will go out.
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Section 9 Cirrus Design
Supplements SR20
Turns while in GPSS mode can exceed the standard rate by
20% to 30%.
In NAV mode while tracking a GPS or VOR/LOC signal, during
the intercept sequence the autopilot operates at maximum
gain and sensitivity (90% of standard rate turn). When the
selected course is intercepted, course deviation needle
centered, the course-tracking program is activated. The
system will remain at maximum sensitivity for approximately
15 seconds while the wind correction angle is established.
The maximum turn rate is then reduced to 45% standard rate.
　
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