Cirrus SR22 Pilot Operating Handbook page 364

Section 9 Cirrus Design
Supplements SR22 / SR22T
GFC 705 AFCS Mode Controller
The GFC 705 AFCS Mode Controller, located in the upper section of
the center console, provides primary control of Autopilot modes and, if
installed, yaw damper engagement. A pitch wheel is included for
adjustment of pitch mode reference. 28 VDC for GFC 705 AFCS Mode
Controller operation is supplied through 5-amp KEYPADS / AP CTRL
circuit breaker on MAIN BUS 1. All Autopilot mode selection is
performed by using the mode select buttons and pitch wheel on the
controller. Available functions are as follows:
HDG - Heading Button
The HDG hold button selects/deselects the Heading Select mode.
Heading Select commands the Flight Director to follow the heading
bug (selected with the HDG knob).
NAV - Navigation Button
The NAV button selects/deselects the Navigation mode. This provides
lower gains for VOR enroute tracking and disables glideslope coupling
for localizer or back course approaches and glideslope coupling for
GPS approaches. This button is also used to couple to the GPS.
APR - Approach Button
The APR button selects the Approach mode. This provides higher
gains for VOR approach tracking and enables glideslope coupling for
ILS approaches and GPS coupling for LPV (Localizer Performance
with Vertical Guidance) and LNAV +V approaches.
AP - Autopilot Button
The AP button engages/disengages the Autopilot.
LVL - Level Button
The LVL button engages the Autopilot (within the Autopilot
Engagement Limits if not already engaged) and commands roll to zero
bank angle and pitch to zero vertical speed. The LVL button will not
engage, or will disengage, if the Stall Warning System is activated.
FD - Flight Director Button.
The FD button toggles the Flight Director activation. It turns on the
Flight Director in the default pitch and roll modes if no modes were
previously selected. Pressing the FD button with command bars in
view, will deactivate the Flight Director and remove the command bars
unless the Autopilot is engaged. If the Autopilot is engaged, the FD
button is deactivated.
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Revision 04: 09-08-14