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than 24 VDC) to the Turn Coordinator rate gyro. The turn coordinator
has its own backup power supply. Refer to basic Handbook.
Revision 1: 12-07-04
P/N 11934-S07 1 of 10
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
S-Tec System Thirty Autopilot
When the S-Tec System Thirty Autopilot is installed in the Cirrus
Design SR20, this Supplement is applicable and must be inserted in
the Supplements Section (Section 9) of the Cirrus Design SR20 Pilot’s
Operating Handbook. This document must be carried in the airplane at
all times. Information in this supplement either adds to, supersedes, or
deletes information in the basic SR20 Pilot’s Operating Handbook.
• Note •
This POH Supplement Revision dated 12-07-04 supersedes
and replaces Revision 1 of this supplement dated 02-14-00.
Revision 2: 12-07-04
2 of 10 P/N 11934-S07
Section 9 Cirrus Design
Supplements SR20
Figure - 1
Section 1 - General
This airplane is equipped with an S-TEC System Thirty Autopilot. This
two-axis autopilot system receives roll axis control inputs from an
integral electric turn coordinator and altitude information from an
altitude transducer plumbed into the pitot-static system. The
programmer, computer/amplifier, and annunciators are contained
entirely within the turn coordinator case. Pilot inputs to the autopilot
are made through the Multi-function Control Knob at the upper left of
the turn coordinator, through the Altitude Hold switches on the control
yoke handles, and the trim control switches on the control yoke
handles. The control knob provides mode selection, disengage, and
turn command functions. The autopilot makes roll changes through the
aileron trim motor and spring cartridge and makes pitch changes for
altitude hold through the pitch trim motor and spring cartridge. The STec
System Thirty Autopilot features:
• Roll Stabilization.
• Turn Command.
• NAV/LOC/GPS tracking; HI and LO sensitivity.
• Altitude Hold.
L R
SR20_FM09_1052
N O P I T C H I N F O R M A TI O N
P US H/H OL D A P D IS C
LO HI
TURN COORDINATOR
2 MIN
UP
TRIM
RDY DN
ALT
ST HD TRK
L R
System 30 Autopilot
Revision 2: 12-07-04
P/N 11934-S07 3 of 10
Cirrus Design Section 9
SR20 Supplements
Section 2 - Limitations
1. Autopilot operation is prohibited above 180 KIAS.
2. The autopilot must not be engaged for takeoff or landing.
3. The autopilot must be disengaged for missed approach, goaround,
and balked landing.
4. Flaps must be set to 50% for autopilot operation in Altitude Hold at
airspeeds below 95 KIAS.
5. Flap deflection is limited to 50% during autopilot operations.
6. The autopilot must be disconnected in moderate or severe
turbulence.
7. The autopilot must be disengaged no later than 100 feet below the
Minimum Descent Altitude.
8. Minimum engage height for the autopilot is 400 ft AGL.
9. Minimum speed with the autopilot engaged is 1.2Vs for the given
configuration.
Section 3 - Emergency Procedures
Autopilot Malfunction
Refer to Electric Trim/Autopilot Failure procedure in the basic
Handbook. Do not reengage the autopilot until the malfunction has
been identified and corrected.
The autopilot may be disconnected by:
1. Pressing and holding the Mode Selector Knob on the Turn
Coordinator for approximately 2 seconds.
2. Pressing the A/P DISC/Trim switch on either control yoke handle.
3. Pulling the AUTOPILOT circuit breaker on the Main Bus 1.
Altitude lost during a roll axis autopilot malfunction and recovery:
Flight Phase Bank Angle Altitude Loss
Climb 30° None
Cruise 55° 100 ft
Descent 55° 120 ft
Revision 2: 12-07-04
4 of 10 P/N 11934-S07
Section 9 Cirrus Design
Supplements SR20
Altitude lost during a pitch axis autopilot malfunction and recovery:
Section 4 - Normal Procedures
Refer to Section 7 – Systems Description for a description of the
autopilot and its modes.
Autopilot Pre-Flight Test
1. Battery Master Switch ............................................................... ON
2. Avionics Power Switch .............................................................. ON
Note that all autopilot annunciators, except TRIM UP and DN,
illuminate. After a few seconds all lights will go out. When the turn
coordinator gyro has reached operational RPM, the green RDY
light will illuminate.
3. ST (Stabilizer) Mode ..............................................................TEST
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