Autopilot - Cirrus SR22 Pilot Operating Handbook

Section 7
Airplane Description

Autopilot

Serials with Avionics Configuration A - 0002 through 1601, 1603
through 1643 and 1645 through 1662 without PFD:
These airplanes are equipped with an S-TEC System Thirty Autopilot
with GPSS. 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, 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. The S-Tec
System Thirty Autopilot features:
• Roll Stabilization.
• Turn Command.
• NAV/LOC/GPS tracking; HI and LO sensitivity.
• Altitude Hold.
• 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. 28 VDC for
autopilot operation is supplied through the 5-amp AUTOPILOT circuit
breaker on the Essential Bus.
Refer to S-TEC System Thirty Autopilot Pilot's Operating Handbook
(P/N 8777) dated Feb. 1999 or later, S-TEC-Meggit Global Positioning
System Steering (GPSS) Converter Pilot's Operating Handbook (P/N
8799) dated 8 Feb. 2001 or later, and the applicable POH supplement
for a more complete description of the autopilot, its operating modes,
and additional detailed operating procedures.
7-96
Cirrus Design
SR22
P/N 13772-001
Revision A10