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REV
APR
Original Issue: 12-18-08
6 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Flashing NAV, REV, or APR with steady FAIL
or
or
and
Invalid radio navigation signal.
1. Check Nav radio for proper reception. Use HDG mode until
problem is corrected.
Flashing VS
Excessive vertical speed error over selected vertical speed. Usually
occurs in climb.
1. Reduce VS command and/or adjust power as appropriate.
NAV
REV
APR
FAIL
VS
Original Issue: 12-18-08
P/N 11934-S40 7 of 20
Cirrus Design Section 9
SR20 Supplements
Section 4 - Normal Procedures
• Note •
Additional normal operating procedures for the System Fifty
Five SR are described in the S-Tec System Fifty Five SR
Pilot’s Operating Handbook.
PreFlight Inspection
1. Manual Electric Trim ..............................................................TEST
Press the AP DISC button down and hold while commanding trim.
Trim should not operate either nose up or nose down.
2. Engage Autopilot Heading Mode ....................... Press HDG button
3. Engage Autopilot Altitude Hold Mode ..................Press ALT button
4. Autopilot Override ..................................................................TEST
Move flight controls fore, aft, left and right to verify that the
autopilot can be overpowered.
5. Disengage Autopilot.....................................Press AP DISC button
6. Trim ................................................................ SET FOR TAKEOFF
7. Autopilot RDY Light ......................................................CHECK ON
8. Trim airplane for existing flight conditions.
Original Issue: 12-18-08
8 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Mode Selection
Heading Mode
1. Set the PFD Heading Bug to the desired heading on the compass
card.
2. Press HDG on Programmer/Computer. The HDG annunciation will
illuminate and the airplane will turn to the selected heading.
3. Use the PFD Heading Bug to make heading changes as desired.
Navigation Mode
1. Select a reliable VOR or VOR-LOC signal on the NAV receiver.
2. Set the PFD Course Pointer to the desired course on the compass
card.
3. Press NAV on Programmer/Computer. The HDG annunciation will
illuminate and the airplane will turn to the selected navigational
aid.
If the course needle is at full-scale deflection or if the aircraft's
closure rate to the selected course is sufficiently slow, the autopilot
will establish the airplane on a heading for a 45° intercept with the
selected course. Otherwise, the intercept angle will be less than
45°. As the airplane approaches the course, the autopilot will
smoothly shallow the intercept angle.
To manually select an intercept angle other than 45°:
a. Set the PFD Heading Bug to the desired course, such that the
difference between this heading and the desired course is the
intercept angle.
b. Set the PFD Course Pointer to the desired course.
c. Press and hold HDG and simultaneously press NAV once on
the Programmer/Computer. HDG and NAV annunciations will
illuminate and the airplane will turn to the selected heading.
d. When the on-course intercept turn begins the HDG mode will
disengage and the annunciation will go out.
Original Issue: 12-18-08
P/N 11934-S40 9 of 20
Cirrus Design Section 9
SR20 Supplements
Global Positioning System Steering (GPSS) Mode
1. Select a reliable GPS signal on the NAV receiver.
2. Engage GPSS mode:
a. If NAV mode is already engaged, press NAV on Programmer/
Computer once.
b. If NAV mode is not engaged, press NAV on Programmer/
Computer twice.
3. The NAV annunciation and GPSS will illuminate and the autopilot
will steer the aircraft along the predefined course programmed into
the NAV receiver.
During the GPSS mode of operation, the autopilot will not accept
any course error input from the PFD Course Pointer.
If there are no programmed course segments in the Programmer/
Computer upon attempted engagement of the GPSS mode, the
FAIL annunciation will appear, NAV and GPSS annunciations will
flash, and the autopilot will hold the aircraft's wings level.
To manually select an intercept angle:
a. Set the PFD Heading Bug to the desired course, such that the
difference between this heading and the desired course is the
intercept angle.
b. Press and hold HDG and simultaneously press NAV twice on
the Programmer/Computer. HDG, NAV, and GPSS
annunciations will illuminate and the airplane will turn to the
　
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