Cirrus Design
Section 9
SR22 / SR22T
Supplements
P/N 13772-135
27 of 30
to a nose-up pitch to aggressively return to original altitude or
glidepath/slope.
2. Disengage Autopilot via AP DISC and manually fly.
3. Change Autopilot modes to one in which the AFCS can maintain
(such as VS with a negative rate).
Non-Altitude Critical Mode (VS, PIT, VNAV, LVL, IAS)
For all non-altitude critical modes the Autopilot will maintain its original
reference (VS, PIT, etc...) until airspeed decays to a minimum airspeed
(MINSPD). Crew alert and annunciation during a non-altitude critical
underspeed event are similar to an altitude-critical event, except that;
• Stall warning may not be active. Depending on load tolerances,
the AP/FD may reach the minimum airspeed reference and take
underspeed corrective action before stall warning occurs. If stall
warning does coincide or precede the aircraft reaching its
minimum airspeed reference, it has no influence - only airspeed
affects the AP/FD in non-altitude critical events.
• The originally selected lateral mode remains active.
Upon reaching minimum airspeed, the AFCS will abandon its Flight
Director and Autopilot reference modes and maintain this airspeed
until recovery. As with altitude-critical modes, available options for
recovery are add power, decouple/manually fly, or change Autopilot
modes.
When adding power, unlike the altitude-critical modes, which performs
an aggressive recovery, the AP/FD will maintain MINSPD until the
original reference can be maintained. Non-altitude critical modes will
maintain the originally selected lateral mode (HDG, NAV, etc...).
Coupled Go-Around
Airplanes equipped with Underspeed Protection Mode are capable of
flying fully coupled go-around maneuvers. Pressing the GA button on
the throttle will not disengage the Autopilot. Instead, the Autopilot will
attempt to capture and track the Flight Director command bars. If
insufficient airplane performance is available to follow the commands,
the AFCS will enter Altitude-Critical Mode when the stall warning
sounds.
Revision 03: 12-14-10
