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Original Issue: 12-18-08
2 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Section 1 - General
This airplane is equipped with an S-TEC System Fifty Five SR
Autopilot. Refer to S-Tec System Fifty Five SR Pilot’s Operating
Handbook for full operational procedures and description of
implemented modes.
Refer to the Perspective Integrated Avionics System Pilot’s Guide for a
detailed description of the avionics system and it’s operating modes.
Section 2 - Limitations
1. If aircraft equipped with S-Tec System Fifty Five SR, Pilot’s
Operating Handbook, P/N PN 87127, 2nd edition or later must be
immediately available to the pilot during flight.
2. The Cirrus Perspective by Garmin Integrated Avionics System
Pilot’s Guide for the SR20 and SR22, P/N 190-00820-02 Rev A or
later must be immediately available to the pilot during flight. The
software status stated in the pilot's guide must match that
displayed on the equipment.
3. Autopilot operation is prohibited above 180 KIAS.
4. The autopilot must not be engaged for takeoff or landing.
5. The autopilot must be disengaged for missed approach, goaround,
and balked landing.
6. Flaps must be set to 50% for autopilot operation in Altitude Hold at
airspeeds below 95 KIAS.
7. Flap deflection is limited to 50% during autopilot operations.
8. The autopilot must be disconnected in moderate or severe
turbulence.
9. Minimum engage height for the autopilot is 400 ft AGL.
10. Minimum speed with the autopilot engaged is 1.2Vs for the given
configuration.
11. For VOR/GPS localizer intercept, capture, and tracking, the
following limitations apply:
a. The autopilot must be disengaged no later than 100 feet below
the Minimum Descent Altitude.
Original Issue: 12-18-08
P/N 11934-S40 3 of 20
Cirrus Design Section 9
SR20 Supplements
b. The autopilot must be disconnect during approach if course
deviation exceeds 50%. The approach should only be
continued by “hand-flying” the airplane.
c. The autopilot must be disengaged at the Decision Height.
d. 12 knot maximum crosswind component between the missed
approach point and outer marker.
e. The intercept of the localizer shall occur at least 5 miles
outside of the outer marker.
f. If the crosswind component is greater than 12 knots and less
than 17 knots, the intercept shall occur at least 10 miles
outside of the outer marker.
g. The intercept angle shall be no greater than a 45-degree
intercept.
h. The flaps should be extended in the approach configuration
prior to the Outer Marker. No further changes in the flap
configuration should be made throughout the autopilotcoupled
approach.
Original Issue: 12-18-08
4 of 20 P/N 11934-S40
Section 9 Cirrus Design
Supplements SR20
Section 3 - Emergency Procedures
Autopilot Malfunction
Refer to Electric Trim/Autopilot Failure procedure in the basic Pilot’s
Operating Handbook. Do not reengage the autopilot until the
malfunction has been identified and corrected. The autopilot may be
disconnected by:
1. Pressing the A/P DISC on the control yoke.
or
2. Pulling the KEYPADS/AP CTRL circuit breaker on MAIN BUS 1.
Altitude lost during a roll axis autopilot malfunction and recovery:
Flight Phase Bank Angle Altitude Loss
Climb 40° 200 ft
Cruise 45° 300 ft
Descent 40° 350 ft
Maneuvering 10° 60 ft
Approach 10° 80 ft
Original Issue: 12-18-08
P/N 11934-S40 5 of 20
Cirrus Design Section 9
SR20 Supplements
Section 3A - Abnormal Procedures
Autopilot Display Flashing 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.
Flashing RDY for 5 seconds with audible tone.
Autopilot disconnect. All annunciations except RDY are cleared.
1. Continue flight without autopilot.
Flashing RDY with audible tone then goes out.
Turn coordinator gyro speed low. Autopilot disengages and cannot be
re-engaged.
1. Check power to turn coordinator.
Flashing NAV, REV, or APR
or
or
Off navigation course by 50% needle deviation or more.
1. Use HDG mode until problem is identified. Crosscheck raw NAV
data, compass heading, and radio operation.
Continued on following page.
RDY
RDY
NAV
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