Overspeed Protection; Underspeed Protection - Garmin Cirrus Perspective SR20 Pilot's Manual

AUTOMATIC FLIGHT CONTROL SYSTEM

OVERSPEED PROTECTION

Overspeed protection is not active in ALT, GS or GP Modes.
NOTE:
While Pitch Hold, Vertical Speed, Indicated Airspeed, Vertical Path Tracking, or an altitude capture mode is
active, airspeed is monitored by the flight director. Pitch commands are not changed until overspeed protection
becomes active. Overspeed protection is provided in situations where the flight director cannot acquire and
maintain the mode reference for the selected vertical mode without exceeding the certified maximum autopilot
airspeed.
When an autopilot overspeed condition occurs, the Airspeed Reference appears in a box above the Airspeed
Indicator, flashing a yellow 'MAXSPD' annunciation. The autopilot, if engaged, will follow the pitch up
command from the flight director. Engine power should be reduced and/or the pitch reference adjusted to slow
the aircraft. The annunciation disappears when the overspeed condition is resolved.
When the autopilot is outside normal operating limits, it uses more aggressive commands to return
NOTE:
to normal limits.
Airspeed
Indicator

UNDERSPEED PROTECTION

While underspeed protection is active, the aircraft will deviate from the selected reference.
NOTE:
Underspeed Protection is designed to discourage aircraft operation below minimum established airspeeds and
is available when the autopilot is on.
When the aircraft reaches a predetermined airspeed (Table 7-6), a yellow MINSPD annunciation (Figure 7-45)
will appear above the airspeed indicator. When the airspeed trend vector reaches a predetermined airspeed
(Table 7-6), a single aural "AIRSPEED" will sound, alerting the pilot to the impending underspeed condition.
TKS FIKI *
* The optional TKS Flight Into Known Icing (FIKI) Anti-Ice System is only
available on SR22 Models
Cirrus Perspective
478
Figure 7-44 Overspeed Annunciation
Flaps MINSPD Annunciation
0%
OFF 50%
100%
0%
ON
50%
Table 7-6 MINSPD Annunciation and AIRSPEED Alert
by Garmin – Pilot's Guide for the SR20/SR22/SR22T
™
Aural AIRSPEED Alert
80 kt 85 kt
76 kt 80 kt
70 kt 80 kt
85 kt 90 kt
81 kt 85 kt
190-00820-08 Rev. A