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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 3: 07-18-05
8 of 16 P/N 11934-S08
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.
• 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 Tests
1. Battery Master Switch ............................................................... ON
2. 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.
3. Heading Mode........................................................................TEST
a. Center the HDG bug under the lubber line on the HSI.
b. Momentarily press HDG button on autopilot Mode Selector.
Note that HDG light illuminates.
c. Then rotate HDG knob on the HSI to the left then right. Note
that control yokes follow movement of knob. Then return HDG
bug to lubber line.
4. Vertical Speed........................................................................TEST
a. Press VS button on autopilot programmer/computer. Note that
VS light illuminates VS+0.
b. Rotate the VS control knob to 500 FPM up (+5). After a short
delay, the control yoke will move aft.
c. Rotate the VS control knob to 500 FPM down (-5). After a
short delay, the control yoke will move forward.
5. Altitude Hold...........................................................................TEST
a. Depress ALT button on autopilot programmer/computer. Note
that ALT annunciator comes on, VS annunciator goes out, and
yoke does not move.
Revision 3: 07-18-05
P/N 11934-S08 9 of 16
Cirrus Design Section 9
SR20 Supplements
6. Overpower Test:
a. 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.
7. Radio Check:
a. Turn on NAV1 radio, with a valid NAV signal, and select VLOC
for display on the HSI.
b. Use autopilot programmer/computer to engage NAV mode
and move OBS so that VOR deviation needle moves left or
right. Note that control yokes follow direction of needle
movement.
8. Autopilot Disconnect Tests:
a. 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.
b. Repeat step using Copilot A/P DISC/Trim Switch.
In-flight Procedures
1. RDY Light.....................................................................CHECK ON
2. Trim airplane for existing flight conditions.
3. Engage desired mode by pressing mode selector button on
autopilot programmer/computer.
Heading Mode
1. Begin by selecting a heading on HSI within 10° of the current
airplane heading.
2. Press HDG button on autopilot programmer/computer. The HDG
annunciator will illuminate and the airplane will turn to the selected
heading.
3. Use HSI HDG bug to make heading changes as desired.
Revision 3: 07-18-05
10 of 16 P/N 11934-S08
Section 9 Cirrus Design
Supplements SR20
Altitude Hold Mode
• Note •Manually fly the airplane to the desired altitude and level off.
• Note •
For smoothest transition to altitude hold, the airplane rate of
climb or descent should be less than 100 FPM when Altitude
Hold is selected.
1. Press HDG or NAV to engage a roll mode. The associated
annunciator will illuminate.
• Note •
A roll mode must be engaged prior to engaging a pitch mode.
2. Press the ALT button on the autopilot programmer/computer. The
ALT annunciator will illuminate indicating that the mode is
engaged and the autopilot will hold the present altitude.
• Note •
Manually flying the airplane off the selected altitude will not
disengage altitude hold and the autopilot will command a pitch
　
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