Cirrus Perspective
™
by Garmin – Pilot’s Guide for the SR20/SR22/SR22T
190-00820-08 Rev. A
462
AUTOMATIC FLIGHT CONTROL SYSTEM
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL FEA
TURES
APPENDICES
INDEX
Yaw damper disengagement is indicated by a five-second flashing yellow ‘YD’ annunciation. Automatic yaw
damper disengagement occurs when autopilot disengagement is caused by failure in a parameter also affecting
the yaw damper. This means the yaw damper can remain operational in some cases where the autopilot
automatically disengages. A localized failure in the yaw damper system or invalid sensor data also cause yaw
damper disengagement.
Figure 7-30 Automatic Autopilot and Yaw Damper Disengagement
REVERSIONARY MODE
In the event of a PFD failure, the MFD goes into reversionary mode. The autopilot remains engaged but
reverts to pitch hold and roll hold modes; all other modes are available for selection. If the MFD fails, the PFD
goes into reversionary mode and the autopilot continues to function.
MISCOMPARE
Critical
values generated by redundant sensors are monitored by comparators. If differences in the sensors
exceed a specified amount, the Comparator Window appears in the upper right corner of the PFD and the
discrepancy is annunciated in the Comparator Window as a ‘MISCOMP’ (miscompare). If one or both of the
sensed values are unavailable, it will be annunciated as a ‘NO COMP’ (no compare).
Figure 7-31 Comparator Window
For dual AHRS and/or dual Air Data Computer installations, reversionary sensor selection is annunciated in
a window on the right side of the PFD. These annunciations reflect reversionary sensors selected on the PFD.
Pressing the
SENSOR
Softkey accesses the
ADC1
,
ADC2
,
AHRS1
, and
AHRS2
softkeys. These softkeys allow
switching of the sensors being viewed on the PFD. The GPS sensor cannot be switched manually.
Figure 7-32 Reversionary Sensor Window
If an ‘AP MISCOMP’ annunciation is displayed in the comparator window the IAU will select the operating
AHRS and the following message (e.g., ‘USING AHRS2’) appears in the reversionary sensor window. When the
‘AP MISCOMP’ annunciation disappears, the pilot must then select the AHRS being used by the IAU (in this
case AHRS2) and re-engage the autopilot. If AHRS1 is selected as the operating AHRS no annunciation will
appear in the reversionary sensor window and the pilot can re-engage the autopilot.
If a miscompare occurs between ADC1 and ADC2 the autopilot does not disengage and the IAU automatically
switches to the operating ADC.
Summary of Contents for Cirrus Perspective SR20
Page 1: ... Cirrus SR20 SR22 SR22T Integrated Avionics System Pilot s Guide ...
Page 2: ......
Page 655: ......