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Flight Phase Bank Angle Altitude Loss
Climb 30° None
Cruise 55° 100 ft
Descent 55° 120 ft
Maneuvering 10° None
Approach 0° 20 ft
Flight Phase Altitude Loss
Cruise 200 ft
Revision 2: 07-18-05
P/N 11934-S27 7 of 16
Cirrus Design Section 9
SR20 Supplements
System Failure and Caution Annunciations
If any of the following failure annunciations occur at low altitude or
during an actual instrument approach, disengage the autopilot,
execute a go-around or missed approach as appropriate. Inform ATC
of problem. Do not try to troubleshoot until a safe altitude and
maneuvering area are reached or a safe landing is completed.
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.
Revision 2: 07-18-05
8 of 16 P/N 11934-S27
Section 9 Cirrus Design
Supplements SR20
Section 4 - Normal Procedures
Refer to Section 7 – Systems Description for a description of the
autopilot modes.
• WARNING •
The pilot must properly monitor and control the engine power
to avoid stalling the airplane in autopilot altitude hold or
vertical speed modes.
Autopilot Pre-Flight Test
1. Battery 1 Master Switch ............................................................ ON
2. Transponder .............................................................................. ON
3. Avionics Power Switch .............................................................. ON
Note that all autopilot annunciator 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. Autopilot Tests
a. Heading Mode .................................................................TEST
1.) Momentarily press HDG button on autopilot Mode
Selector. Note that HDG light illuminates.
2.) Select and rotate the HDG bug knob on the PFD to the left
then right. Note that control yokes follow movement of
knob.
b. Activate a GPS flight plan or waypoint on the GPS navigator
(GPS 1).
c. Press and release the GPSS/HDG switch. HDG will go out
and GPSS will flash. Note that the HDG bug will no longer
move the control yokes.
• Note •
The GPSS requires a ground speed component to function,
therefore the GPSS function cannot be ground tested.
d. Press and release the GPSS/HDG switch. GPSS will go out
and HDG will come on.
Revision 2: 07-18-05
P/N 11934-S27 9 of 16
Cirrus Design Section 9
SR20 Supplements
e. Altitude Hold ....................................................................TEST
1.) Depress ALT button on autopilot programmer/computer.
Note that ALT annunciator comes on, VS annunciator
goes out, and yoke does not move.
f. Overpower Test:
1.) Grasp control yoke and input left aileron, right aileron,
nose up, and nose down to overpower autopilot.
Overpower action should be smooth in each direction with
no noise or jerky feel.
g. Radio Check:
1.) Turn on NAV1 radio, with a valid NAV signal, and select
VLOC for display on the PFD.
2.) Use autopilot programmer/computer to engage NAV
mode and move Course Select knob so that VOR
deviation needle moves left or right. Note that control
yokes follow direction of needle movement.
h. Autopilot Disconnect Tests:
1.) Press Pilot A/P DISC/Trim Switch (control yoke). Note that
the autopilot disengages. Move control yoke to confirm
that pitch and roll control is free with no control restriction
or binding.
2.) Repeat step using Copilot A/P DISC/Trim Switch.
In-Flight Procedures
1. Autopilot RDY Light ......................................................CHECK ON
　
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