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programmer, computer, annunciators, and servo amplifier 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 corner of the turn coordinator. The control knob provides mode
selection, disengage, and turn command functions. A button on each
control yoke handle may be used to disengage the autopilot. The turn
coordinator instrument annunciates system modes. The autopilot
drives the aileron trim motor and spring cartridge to control airplane
roll. The autopilot operates on 28 VDC supplied through the 5-amp
AUTOPILOT circuit breaker on the Essential Bus.
March 2010
Information Manual 7-91
Cirrus Design Section 7
SR20 Airplane Description
The S-Tec System Twenty Autopilot features:
• Roll Stabilization.
• Turn Command.
• Heading Hold interfaced with DG coupled heading bug.
• NAV/LOC/GPS tracking, HI and LO sensitivity.
Avionics Configuration 2.1:
These airplanes are 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, roll computer/amplifier, and annunciators are contained
entirely within the turn coordinator case. The Multi-function Control
Knob at the upper left of the turn coordinator provides mode selection,
disengage, and turn command functions. A button on each control
yoke handle may be used to disengage the autopilot. A separate pitch
computer provides the ALT hold function. Roll axis steering is
accomplished by autopilot steering commands to the aileron trim
motor and spring cartridge. Pitch axis command for altitude hold is
accomplished by pitch computer commands to the elevator servo. The
autopilot operates on 28 VDC supplied through the 5-amp
AUTOPILOT circuit breaker on the Essential Bus. The S-Tec System
Thirty Autopilot features:
• Roll Stabilization;
• Turn Command;
• NAV/LOC/GPS tracking; HI and LO sensitivity;
• Altitude Hold; and
• GPS Steering (GPSS) for smoother turns onto a course or
during course tracking.
A separate GPSS converter provides GPS roll steering to the
autopilot. A GPSS/HDG button allows the operator to switch between
HDG and Roll Steering modes. In the HDG mode the autopilot
responds to the HDG bug on the HSI. In the GPSS mode, the autopilot
responds to roll steering inputs from the GPS navigator.
Refer to S-TEC System Thirty Autopilot Pilot’s Operating Handbook
(P/N 8777) dated Feb 1999 or later and the applicable POH
March 2010
7-92 Information Manual
Section 7 Cirrus Design
Airplane Description SR20
supplement for a more complete description of the autopilot, its
operating modes, and additional detailed operating procedures.
Refer to S-TEC-Meggit Global Positioning System Steering (GPSS)
Converter Pilot’s Operating Handbook (P/N 8799) dated 8 Feb 2001 or
later and applicable POH supplement for a more complete description
of the GPSS converter, its modes, and additional operating
procedures.
Avionics Configuration 2.2:
These airplanes are equipped with an S-TEC System 55X Autopilot
with Altitude Selector / Alerter. The System 55X autopilot is a two-axis
autopilot system. The system consists of a flight guidance
programmer/computer, altitude selector/alerter, altitude transducer,
turn coordinator, and HSI. Mode selection and vertical speed selection
are made on the programmer/computer panel. The altitude selector/
alerter allows the pilot to pre-select altitudes and rates of climb or
descent to be used by the autopilot. A button on each control yoke
handle may be used to disengage the autopilot. The autopilot makes
roll changes through the aileron trim motor and spring cartridge and
makes pitch changes for altitude preselect and hold through the
elevator trim motor. The autopilot operates on 28 VDC supplied
through the 5-amp AUTOPILOT circuit breaker on the Essential Bus.
The S-Tec System 55X Autopilot features:
• Heading Hold and Command;
• NAV/LOC/GPS/GS tracking, high and low sensitivity, and
automatic 45° -course intercept;
• Altitude and Climb/Descent Rate Preselect
• Altitude Hold and Command;
• Vertical Speed Hold and Command; and
• GPS Steering (GPSS) for smoother turns onto a course or
during course tracking.
Refer to S-Tec System Fifty-Five X Autopilot Pilot’s Operating
Handbook (POH), P/N 87109 dated 8 November 2000 or later revision
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西锐20飞机信息手册CIRRUS DESIGN SR20 AIRPLANE INFORMATION MA(81)
