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selected heading.
c. When the on-course intercept turn begins the HDG mode will
disengage and the annunciation will go out.
Original Issue: 12-18-08
10 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Altitude Hold Mode
1. Manually fly the airplane to the desired altitude and level off.
2. Press HDG, NAV, GPSS, APR, or REV to engage a roll mode. The
associated annunciations will illuminate.
3. Press ALT on the Programmer/Computer. The ALT annunciation
will illuminate indicating that the mode is engaged and the
autopilot will hold the present altitude.
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.
Altitude can be changed to another altitude by rotating the VS
knob on the Programmer/Computer.
Engagement of the altitude hold mode will reset the PFD Altitude
Bug to the captured altitude.
Vertical Speed Mode
1. Press HDG, NAV, GPSS, APR, or REV to engage a roll mode. The
associated annunciations will illuminate.
2. Set the PFD Vertical Speed Bug to the desired vertical speed.
3. Press VS on the Programmer/Computer to engage the vertical
speed mode. The VS annunciation will illuminate indicating that
the mode is engaged and the autopilot will synchronize to and
hold the vertical speed at the time the mode was engaged.
The vertical speed is displayed in 100-foot increments at the far
right of the Programmer/Computer window next to the VS
annunciation. 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.
Original Issue: 12-18-08
P/N 11934-S40 11 of 20
Cirrus Design Section 9
SR20 Supplements
Section 5 - Performance
• WARNING •
The autopilot may not be able to maintain all selectable
vertical speeds. Selecting a vertical speed that exceeds the
aircraft’s available performance may cause the aircraft to stall.
The autopilot will disconnect if the Stall Warning System is activated.
Section 6 - Weight & Balance
Refer to Section 6 - Weight and Balance of the basic POH for current
weight and balance data.
Original Issue: 12-18-08
12 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Section 7 - System Description
The airplane is equipped with an S-Tec System Fifty Five SR two-axis
autopilot. The system consists of the Programmer / Computer, Flight
Management System Keyboard, Turn Coordinator, Altitude
Transducer, Integrated Avionics Unit #2, Pitch Servo, Roll and Pitch
Trim Cartridges, Autopilot Disconnect Switch, Electric Pitch-Trim and
Roll-Trim Hat Switch, and Annunciation System.
The autopilot controls the aircraft pitch and roll attitudes. Autopilot
operation occurs within the Programmer/Computer installed in the
upper section of the center console and provides:
• Autopilot engagement and annunciation
• Autopilot command and control
• Auto-trim operation
• Manual electric trim
• Two axis airplane control (pitch and roll), including approaches
Original Issue: 12-18-08
P/N 11934-S40 13 of 20
Cirrus Design Section 9
SR20 Supplements
HDG NAV APR REV ALT VS
S-TEC FIFTY FIVE SR
HDG NAV APR REV TRIM ALT VS + R
D
Y
C
W
S
F
L
A
I
G
S
P
S
VS x 100
IN C R
D E C R
A/P DISC
SWITCH
L R
ST HD TRK
ALT
RDY DN
TRIM
UP
2 MIN
TURN COORDINATOR
HILO
N OITAMROFNI HCTIP ON
SR20_FM09_3019
PFD INTEGRATED MFD
AVIONICS UNIT 2
STEC SYSTEM 55SR
AUTOPILOT
TURN COORDINATOR
ROLL TRIM CARTRIDGE
PITCH TRIM CARTRIDGE
PITCH TRIM SERVO
ALTITUDE TRANSDUCER
Figure - 1
System Schematic
Original Issue: 12-18-08
14 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Programmer / Computer
The Programmer / Computer, located in the upper section of the
center console, provides primary control of autopilot modes.
28 VDC for Programmer / Computer operation is supplied through the
5-amp KEYPADS / AP CTRL circuit breaker on MAIN BUS 1.
All Autopilot mode selection is performed by using the mode select
buttons and VS modifier knob. Available functions are as follows:
RDY - Ready Mode
Illuminates when autopilot is ready for engagement. When the
airplane’s Battery Master switch is turned on and the rate gyro RPM is
　
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