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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.
Revision A7
P/N 13772-001 7-89
Cirrus Design Section 7
SR22 Airplane Description
Serials with Avionics Configuration B - 0002 through 1601, 1603
through 1643 and 1645 through 1662 without PFD:
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 encoder, altitude selector / alerter, turn
coordinator, and HSI. Mode selection and vertical speed 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 SR22 installation of 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;
• GPS Steering (GPSS);
• Altitude Pre-select, Hold and Command, Altitude display, and
baro correction;
• Altitude and Decision Height (DH) alert; and
• Vertical Speed Hold and Command.
28 VDC for autopilot and altitude selector/alerter is supplied through
the 5-amp AUTOPILOT circuit breaker on the Essential Bus.
Refer to S-Tec System Fifty-Five X Autopilot Pilot's Operating
Handbook, P/N 87109 dated 8 November 2000 or later, Refer to S-Tec
Altitude Selector / Alerter Pilot’s Operating Handbook (POH) P/N 8716
or P/N 87110 (no revision or later) for full operational procedures and
detailed description of operational modes of the Altitude Selector /
Alerter.
Avionics Configuration PFD - Serials 0435 and subsequent with
PFD:
These airplanes are equipped with an S-TEC System 55X or 55SR
Autopilot and are fully integrated with the Entegra PFD. Heading,
Altitude and VSI (55X only) reference bugs are provided to aid in
autopilot control and pilot situational awareness. When in an active
Revision A8
7-90 P/N 13772-001
Section 7 Cirrus Design
Airplane Description SR22
autopilot mode, full guidance is provided, including smooth transitions
to altitude and heading captures. If not in an active autopilot mode
(i.e., “hand-flying”), there is no guidance other than the position of the
appropriate bugs, as set by the pilot. A button on each control yoke
handle may be used to disengage the autopilot.
The reference bugs' status, autopilot annunciations, and flight director
steering command bars (if installed) will indicate when Entegra is
coupled with the autopilot. A solid magenta Heading, Altitude, or VSI
(55X only) bug indicates that the function is currently coupled to an
active mode of the autopilot. A hollow magenta bug indicates that the
function is not currently coupled to the autopilot in an active mode. In
other words, a hollow bug indicates manual or “hand-flying” status.
In flight director equipped aircraft, when a vertical mode of the
autopilot is being used, a set of flight director command bars will
indicate the required steering of the aircraft to achieve the commanded
tracking from the autopilot. In autopilot mode, “AP” will be in the
autopilot annunciation field, the command bars will be visible and
magenta and the aircraft should track the bars.
In flight director only mode, “FD” will be displayed in the autopilot
annunciation field, the command bars will be visible and green, and
the pilot is expected to actuate the flight controls as required to track
the bars.
• Note •
One of the horizontal modes (HDG, NAV, GPSS) must be
engaged on the autopilot control interface before a vertical
mode can be used.
When HDG mode is engaged, rotation of the heading bug
greater than 180 degrees may result in a reversal of turn
direction.
The following six modes of the System 55X are supported by the
　
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