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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 Thirty Autopilot is installed.
Section 6 - Weight & Balance
There is no change to the airplane weight & balance when the S-Tec
System Thirty Autopilot is installed.
Revision 2: 12-07-04
8 of 10 P/N 11934-S07
Section 9 Cirrus Design
Supplements SR20
Section 7 - Systems Description
The airplane is equipped with an S-Tec System Thirty two-axis
Automatic Flight Control System (Autopilot). The autopilot roll axis
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 roll computer/amplifier.
An altitude transducer plumbed into the pitot-static system provides
altitude information to a separate pitch computer installed in the
console. Roll axis steering is accomplished by autopilot steering
commands to the aileron trim motor and spring cartridge. Pitch axis
command for altitude hold is accomplished by pitch computer
commands to the elevator trim motor and trim 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.
All Autopilot mode selection and annunciation is performed with the
Turn Coordinator Control Knob and the A/P ALT HOLD buttons on the
pilot’s and copilot’s control yokes. Refer to Figure 1 for an illustration of
the following listed modes and controls:
Revision 2: 12-07-04
P/N 11934-S07 9 of 10
Cirrus Design Section 9
SR20 Supplements
RDY (Ready) Light – Illuminates green when autopilot is ready for
engagement. When the airplane’s Batt Master switch is turned on and
the rate gyro RPM is correct, the green RDY light comes on indicating
the autopilot is ready for the functional check and operation. The
autopilot cannot be engaged unless the RDY light is on.
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.
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 HSI if the GPSS/
HDG switch is in the HDG mode. When HDG mode is selected, the
autopilot will turn the airplane to the selected heading and then follow
the selected heading. Subsequent heading changes can be made
using the HDG knob on the HSI. For smoothest transition to HDG, it is
recommended that the airplane be aligned to within 10° of the selected
heading before engaging HDG.
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 – When ALT is selected by pressing either
A/P ALT HOLD button on the control yoke handles, the autopilot will
hold the altitude at the time the mode was selected. Altitude hold will
not engage if an autopilot roll mode is not engaged. Pressing an A/P
ALT HOLD button again or disengaging the autopilot using Mode
Select/Disconnect switch or control yoke trim switches will disengage
altitude hold.
During ALT mode operation, illumination of either the yellow TRIM UP
and TRIM DN annunciators indicates that the airplane is out of trim
　
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