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TRK is selected. If airplane is more than 5° off the selected
course the autopilot will turn the airplane towards the course
but may not capture and track it.
2. Use Autopilot Mode Selector to select TRK HI mode for GPS
approach and cross-country tracking.
VOR Tracking and VOR-LOC Approach
1. Begin with a reliable VOR or VOR-LOC signal and CDI course
needle centered, with airplane on the suggested heading to the
waypoint.
• Note •
The airplane must be within 5° of the desired course when
TRK is selected. If airplane is more than 5° off the selected
course the autopilot will turn the airplane towards the course
but may not capture and track it.
2. Use Autopilot Mode Selector to select TRK HI mode for approach
or TRK HI or LO for cross-country tracking.
Section 5 - Performance
There is no change to the airplane performance when the S-Tec
System 20 Autopilot is installed.
Section 6 - Weight & Balance
There is no change to the airplane weight & balance when the S-Tec
System 20 Autopilot is installed.
Revision 1: 12-07-04
P/N 11934-S06 7 of 8
Cirrus Design Section 9
SR20 Supplements
Section 7 - Systems Description
The airplane is equipped with an S-Tec System Twenty single-axis
Automatic Flight Control System (Autopilot). The autopilot is a pure
rate autopilot that uses an inclined gyro in the turn coordinator case as
the primary turn and roll rate sensor. In addition to the turn coordinator
instrument and rate gyro, the case encloses an autopilot pick-off, a
gyro RPM detector, an instrument power monitor, and the autopilot
computer/amplifier. Roll axis steering is accomplished by autopilot
steering commands to the aileron trim motor and spring cartridge. Low
electrical power will cause the Turn Coordinator to flag and low RPM
will cause the autopilot to disconnect. 28 VDC for autopilot operation is
supplied through the 5-amp AUTOPILOT circuit breaker on the Main
Bus 1. Turn Coordinator instrument dimming is controlled through the
INST light dimmer on the bolster switch panel.
• Note •
The altitude hold mode discussed in the following paragraphs
and shown in Figure 1 is not available with the System Twenty
Autopilot. This feature is available on the System Thirty
Autopilot. Altitude hold is shown in this supplement only
because both the System Twenty and Thirty Autopilots use the
same Turn Coordinator.
Altitude hold is not selectable and the associated annunciators
will not illuminate.
All Autopilot mode selection and annunciation is performed with the
Turn Coordinator/Autopilot Controller. Refer to Figure 1 for an
illustration of the following listed modes and controls:
RDY (Ready) Light – Illuminates green when autopilot is ready for
engagement. When the airplane’s Battery Master switch is turned on
and the rate gyro RPM is correct, the green RDY light will come on
indicating the autopilot is ready for the functional check and operation.
The autopilot cannot be engaged unless the RDY light is illuminated.
Mode Select / Disconnect Switch – Each momentary push of the
knob will select an autopilot mode, left to right, beginning with ST
(Stabilizer) mode and ending with TRK HI (Track) mode. Holding the
knob in for more than 2 seconds will disengage the autopilot.
Revision 1: 12-07-04
8 of 8 P/N 11934-S06
Section 9 Cirrus Design
Supplements SR20
Depressing either control yoke trim switch will also disengage the
autopilot.
ST (Stabilizer) Mode - Turning the Mode Select Knob left or right in
ST (Stabilizer) mode will provide left/right steering commands to the
autopilot proportional to the knob displacement. Steering command is
limited to a standard rate turn maximum.
HD (Heading) Mode – When HD is selected, the autopilot responds to
heading changes made using the HDG knob on the DG or HSI. If the
airplane heading is within 5° of selected heading when the mode is
selected, the autopilot will turn the airplane to the heading and then
follow the heading. Subsequent heading changes can be made using
the HDG knob on the DG or HSI.
TRK (Track) Mode – When TRK LO is selected, the autopilot will
provide low system gain for comfortable cross country tracking of GPS
or VOR courses. When TRK HI is selected, the autopilot will provide a
higher level of system gain for more active tracking of GPS, VOR, or
Localizer front course signals.
ALT (Altitude Hold), mode and the TRIM UP, and TRIM DN
annunciators are not functional with the System Twenty Autopilot.
Flag Window – A red flag indicates insufficient electrical power (less
　
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