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increased sensitivity for VOR or GPS approaches. APR may also be
used to provide increased sensitivity for enroute course tracking.
GS (Glideslope) - The autopilot GS function will capture and track an
ILS glideslope. To arm the GS function, the following conditions must
be met: (1) the NAV receiver must be tuned to the appropriate ILS
frequency; (2) The glideslope signal must be valid - no flag; (3) the
autopilot must be in NAV/APR/ALT modes; and (4) the airplane must
be 60% or more below the glideslope centerline during the approach
to the intercept point, and within 50% needle deviation of the localizer
centerline at the point of intercept - usually the outer marker. When the
above conditions have existed for 10 seconds, the GS annunciator will
illuminate indicating GS arming has occurred (ALT annunciator will
remain on). When the glideslope is intercepted and captured, the ALT
annunciator will go out.
ALT (Altitude Hold), Mode - When ALT is selected, the autopilot will
hold the altitude at the time the mode was selected. Altitude hold will
not engage if an autopilot roll mode is not engaged. Altitude correction
for enroute barometric pressure changes may be made by rotation of
the VS knob on the autopilot programmer/computer. Clockwise
rotation will increase and counterclockwise rotation will decrease
altitude 20 feet for each 'click.' The maximum adjustment is ±360 feet.
Adjustments greater than 360 feet can be made by selecting VS mode
and flying the airplane to the new altitude and then re-engaging ALT
mode.
VS (Vertical Speed) Mode - When VS is selected, the autopilot will
synchronize to and hold the vertical speed at the time the mode was
selected. Altitude hold will not engage if an autopilot roll mode is not
engaged. The vertical speed is displayed in 100-foot increments at the
far right of the programmer/computer window next to the VS
Revision 3: 07-18-05
16 of 16 P/N 11934-S08
Section 9 Cirrus Design
Supplements SR20
annunciation. A plus (+) value indicates climb and a negative or minus
(-) value indicates descent. Vertical speed can be adjusted by rotating
the VS knob on the programmer/computer. Clockwise rotation
increases and counterclockwise rotation decreases rate of climb (or
descent) 100 FPM for each 'click.' The maximum adjustment is ±1600
FPM.
Revision 3: 07-18-05
P/N 11934-S13 1 of 16
Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
S-Tec System 55X Autopilot
When the S-Tec System Fifty Five X (55X) Autopilot is installed in the
Cirrus Design SR20, this Supplement is applicable and must be
inserted in the Supplements Section (Section 9) of the Cirrus Design
SR20 Pilot’s Operating Handbook. This document must be carried in
the airplane at all times. Information in this supplement adds to,
supersedes, or deletes information in the basic SR20 Pilot’s Operating
Handbook.
• Note •
This POH Supplement Revision dated Revision 4: 08-15-07,
supersedes and replaces Revision 3 of this supplement dated
07-18-05..
Revision 4: 08-15-07
2 of 16 P/N 11934-S13
Section 9 Cirrus Design
Supplements SR20
Section 1 - General
This airplane is equipped with an S-TEC System 55X Autopilot. The
System 55X autopilot is a two-axis autopilot system. The system
consists of a flight guidance programmer/computer, altitude encoder,
altitude selector / alerter, turn coordinator, and HSI. Mode selection
and vertical speed selection is made on the programmer/computer
panel. A button on each control yoke handle may be used to
disengage the autopilot. The autopilot makes roll changes through the
aileron trim motor and spring cartridge and makes pitch changes for
altitude hold through the elevator trim motor. The SR20 installation of
the S-Tec System 55X Autopilot features:
• Heading Hold and Command;
• NAV/LOC/GS tracking, high and low sensitivity, GPSS roll
steering, and automatic 45° course intercept;
• Altitude Hold and Command; and
• Vertical Speed Hold and Command.
Refer to S-Tec System Fifty-Five X Autopilot Pilot’s Operating
Handbook (POH): Serials 1005 thru 1336; P/N 87109 dated 8
November 2000 or later OR Serials 1337 and subsequent; P/N 87247
original release or later for full operational procedures and description
of implemented modes. The System 55X POH also contains detailed
procedures for accomplishing GPS & VOR course tracking, front
course and back course localizer approaches, and glideslope tracking.
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