7-88
P/N 11934-003
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
for full operational procedures and description of implemented modes.
The System 55X POH also contains detailed procedures for
accomplishing GPS & VOR course tracking, front course and back
course localizer approaches, and glideslope tracking.
Revision A5
Summary of Contents for SR20
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