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Annunciation Condition Action
Flashing RDY for 5
seconds with
audible tone.
Autopilot disconnect. All
annunciations except RDY
are cleared.
None.
Flashing RDY with
audible tone then
goes out.
Turn coordinator gyro
speed low. Autopilot
disengages and cannot be
re-engaged.
Check power to turn
coordinator.
Flashing NAV,
REV, or APR.
Off navigation course by
50% needle deviation or
more.
Use HDG mode until
problem is identified.
Crosscheck raw NAV
data, compass heading,
and radio operation.
Flashing NAV,
REV, or APR with
steady FAIL
Invalid radio navigation
signal.
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.
Reduce VS command
and/or adjust power as
appropriate.
Flashing GS Off glideslope centerline by
50% needle deviation or
more.
Check attitude and
power. Adjust power as
appropriate.
Flashing GS with
steady FAIL
Invalid glideslope radio
navigation signal.
Disconnect autopilot and
initiate go-around or
missed approach
procedure. Inform ATC.
Flashing GS plus
ALT.
Manual glideslope disabled. Re-enable by pressing
NAV mode button.
Revision 04: 08-15-07
8 of 24 P/N 11934-S20
Section 9 Cirrus Design
Supplements SR20
Section 4 - Normal Procedures
Refer to Section 7 – Systems Description for a description of the
autopilot and altitude selector and their respective modes.
The Autopilot is integrated with the Altitude Selector/Alerter and can
be operated with or without data inputs from the Altitude Selector/
Alerter. The autopilot ALT and VS modes are coupled to the Altitude
Selector/Alerter ALT and VS outputs by pressing and holding the
Autopilot Programmer/Computer VS button and then pressing the ALT
button. Altitude Selector Vertical Speed output can be individually
coupled to the autopilot through the autopilot VS mode by pressing the
autopilot VS button.
• WARNING •
The pilot must properly monitor and control the engine power
to avoid stalling the airplane in autopilot altitude hold or
vertical speed modes.
• Note •
Any coupled Altitude Selector / Alerter mode can be disabled
by disconnecting the autopilot.
Autopilot and Altitude Selector Pre-Flight Tests
1. Battery Master Switch ............................................................... ON
2. Transponder .............................................................................. ON
3. Avionics Power Switch .............................................................. ON
Note that all autopilot annunciators, except CWS, and TRIM
illuminate. After about 5 seconds, all lights will go out. When the
turn coordinator gyro has reached operational RPM, the RDY
annunciator will come on.
4. Altitude Selector Tests:
a. Altimeter ................................................... Set Field Elevation.
b. Self-Test – On power up, all annunciators come on for
approximately 5 seconds and then sounds an audio tone.
After the self-test is complete, press the DTA and then BAR
buttons on the altitude selector.
Revision 04: 08-15-07
P/N 11934-S20 9 of 24
Cirrus Design Section 9
SR20 Supplements
c. Rotate altitude selector input knob to set BARO to the nearest
0.1 inch Hg.
d. Push ALT button to display ALT SEL. With a flashing SEL
annunciator, rotate the selector knob to input an altitude 300
to 400 feet lower or higher than the indicated altitude.
e. Push the VS button. Rotate the selector input knob to input the
desired climb (+) or descent (-) vertical speed.
f. Push ALT button, ALT SEL annunciator will illuminate.
g. Engage autopilot HDG mode.
h. Press and hold the VS button and then press the ALT button.
Autopilot VS and ALT annunciators will illuminate.
i. Rotate altitude selector knob to change selected altitude to
match field elevation. VS annunciator on autopilot
programmer should go out when the ALT SEL setting on the
altitude selector is within 100 feet of indicated altitude on
altimeter. Autopilot ALT mode should remain illuminated,
indicating autopilot altitude hold is engaged. If ALT
engagement does not occur within 100 feet of indicated
altitude, readjust BARO setting on altitude selector.
5. Autopilot Tests
a. Heading Mode .................................................................TEST
　
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