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on the HSI. For smoothest transition to HDG mode, it is recommended
that the airplane be aligned to within 10° of the selected heading
before engaging HDG. The HDG mode is also used in combination
with the NAV mode to set up a pilot selected intercept angle to a
course.
NAV (Navigation) Mode - When NAV is selected, the autopilot will
provide intercept and tracking of GPS, VOR, and Localizer courses.
For course intercept with full-scale deviation, the autopilot
automatically sets up a 45° intercept angle at maximum gain and
sensitivity (turn is limited to 90% of standard rate). The point at which
the turn to capture the course begins is dependent upon closure rate
and airplane position. When the course is intercepted and the HSI
course deviation needle centered (indicating course capture), the
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Cirrus Design Section 9
SR20 Supplements
autopilot automatically initiates a tracking gain program to reduce turn
rate to 45% standard rate, and then 15% standard rate.
REV (Reverse Course) – When REV is selected, the autopilot will
automatically execute high sensitivity gain for an approach where
tracking the front course outbound or tracking the back course inbound
is required. The APR and REV annunciators will illuminate when REV
is selected.
APR (Approach) – When APR is selected, the autopilot provides
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
annunciation. A plus (+) value indicates climb and a negative or minus
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Section 9 Cirrus Design
Supplements SR20
(-) 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.
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Cirrus Design Section 9
SR20 Supplements
Pilot’s Operating Handbook and
FAA Approved Airplane Flight Manual
Supplement
for
L-3 Avionics Systems SkyWatch
Traffic Advisory System
When the L-3 Avionics Systems SkyWatch 497 is installed in the
Cirrus Design SR20, this POH Supplement is applicable and must be
inserted in the Supplements Section (Section 9) of the appropriate
Cirrus Design 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 Pilot’s Operating
Handbook.
• Note •
This POH Supplement Revision dated 10-12-05 supersedes and
replaces the original release of this supplement dated 08-20-01.
Revision 1: 10-12-05
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