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correct, the RDY annunciation 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.
HDG - Heading Button
When pressed, will engage the Heading mode, which commands the
airplane to turn to and maintain the heading selected by the heading
bug on the HSI. A new heading may be selected at any time and will
result in the airplane turning to the new heading.
NAV - Navigation Button
When NAV is selected, the autopilot will provide intercept and tracking
of GPS, VOR, and Localizer courses. For course intercept with fullscale
deflection, the autopilot automatically sets up a 45° intercept
angle at maximum gain and sensitivity. The point at which the turn to
capture the course begins is dependent upon closure rate and
airplane position. When the course is intercepted and the HSI course
deviation needle centered, the autopilot automatically initiates a
tracking gain program to reduce turn rate to 45% standard rate, and
then 15% standard rate.
GPSS - GPS Steering Mode
Pressing NAV twice will cause the autopilot to go to GPSS for
smoother tracking and transitions. When GPSS is selected, the
autopilot can be switched between heading and GPSS modes of
operation. In the heading mode, the converter receives a heading error
signal from the heading bug on the Horizontal Situation Indicator.
Original Issue: 12-18-08
P/N 11934-S40 15 of 20
Cirrus Design Section 9
SR20 Supplements
GPSS converts this information and sends this heading error directly
to the autopilot.
In the GPSS mode the autopilot can be directly coupled to the roll
Commands produced by the GPS Navigator, eliminating the need for
the pilot to make any further adjustments to the HSI course arrow.
ALT - Altitude Hold Button
When ALT is selected, 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. Altitude correction for enroute barometric
pressure changes may be made by rotation of the VS knob on the
Programmer/Computer.
VS - Vertical Speed Button
When VS is selected, the autopilot will synchronize to and hold the
vertical speed at the time the mode was selected. Altitude hold will not
engage if an autopilot roll mode is not engaged. The vertical speed is
displayed in 100-foot increments at the far right of the Programmer/
Computer window next to the VS annunciation. A plus (+) value
indicates climb and a negative or minus (-) value indicates descent.
Vertical speed can be adjusted by rotating the VS knob on the
Programmer/Computer.
APR - Approach Button
When APR is selected, the autopilot provides increased sensitivity for
VOR or GPS approaches. APR may also be used to provide increased
sensitivity for enroute course tracking
REV- Reverse Course Button
When REV is selected, the autopilot will automatically execute high
sensitivity gain for an approach where tracking the front course
outbound or tracking the back course inbound is required. The APR
and REV annunciations will illuminate when REV is selected.
TRIM - Autotrim
When both a roll mode and a pitch mode are engaged, the autopilot
will provide an annunciation whenever it is automatically trimming the
aircraft. Should the pitch servo loading exceed a preset threshold for a
period of three seconds, the autopilot will annunciate either TRIM 􀁓 or
TRIM 􀁔 as an advisement that the autopilot is automatically trimming
the aircraft. If the autopilot is still in the process of automatically
Original Issue: 12-18-08
16 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
trimming the aircraft after four more seconds, the annunciation will
flash. When the aircraft has been sufficiently trimmed, the
annunciation will extinguish.
VS Modifier Knob
The VS Knob on the Programmer/Computer is used to change the
vertical speed when in vertical speed mode and controls altitude
reference when in altitude hold mode. Each ‘click’ of the knob results
in a step increase or decrease in the selected mode by the amount
shown in the table below.
* Adjustments greater than 360 feet can be made by selecting VS mode and flying
the airplane to the new altitude and then re-engaging ALT mode
Flight Management System Keyboard
The Flight Management System Keyboard, found in the center console
above the programmer / computer, is the primary means for data entry
for the MFD and is used to control NAV/COM Radios, transponder,
and flight management system entry. Heading, course and altitude
　
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