P/N 11934-003
7-89
Cirrus Design
Section 7
SR20
Airplane Description
Refer to S-Tec Altitude Selector / Alerter (P/N 0140) Pilot’s Operating
Handbook
(POH), P/N 8716 (no revision or later) for full operational
procedures and detailed description of operational modes of the
Altitude Selector / Alerter.
Avionics Configuration PFD:
This airplane is equipped with an S-TEC System 55SR Autopilot. The
System 55SR autopilot is a two-axis autopilot system. The system
consists of a flight guidance programmer/computer, altitude
transducer, turn coordinator, and primary flight display (PFD). Mode
selection is made on the programmer/computer panel. 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 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 55SR Autopilot features:
• Heading Hold and Command;
• NAV/LOC/GPS tracking;
• Altitude Hold and Command;
• GPS Steering (GPSS) for smoother turns onto a course or
during course tracking.
GPS Navigation
The Jeppesen Navigation Database provides access to data on
Airports, Approaches, Standard Instrument Departures (SIDs),
Standard Terminal Arrivals (STARs), VORs, NDBs, Intersections,
Minimum Safe Altitudes, Controlled Airspace Advisories and
Frequencies. North American and International databases are
available. Database information is provided on a card that can be
inserted into the card slot on the GPS unit. Subscription information is
provided in a subscription packet provided with each system.
Avionics Configuration 2.0 and PFD:
The airplane is equipped with two GPS navigators. The Garmin GNS
430 navigator is designated GPS 1, IFR certified, and is coupled to the
airplane’s CDI and Multi-Function display. The Garmin GNC 250XL
provides backup, is approved for VFR use only, and is not coupled to
the Multi-Function or Primary Flight Displays. The primary GPS
Revision A5
Summary of Contents for SR20
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