Garmin G1000 NXi Pilot’s Guide for the Cessna NAV III
190-02177-02 Rev. A
395
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
OVERSPEED PROTECTION
NOTE:
Overspeed protection is not active in ALT, GS or GP modes.
While Pitch Hold, Vertical Speed, Flight Level Change, Vertical Path Tracking, or an altitude capture mode is
active, airspeed is monitored by the flight director. Overspeed protection is provided to limit the flight director’s
pitch command in situations where the flight director cannot acquire and maintain the mode reference for the
selected vertical mode without exceeding Vne.
When Overspeed Protection is active, the Airspeed Reference appears in a box above the Airspeed Indicator,
flashing a amber ‘MAXSPD’ annunciation. Engine power should be reduced and/or the pitch reference adjusted
to slow the aircraft. The annunciation disappears when the overspeed condition is resolved.
Figure 7-30 Overspeed Annunciation
UNDERSPEED PROTECTION
Underspeed Protection is available when the optional Electronic Stability and Protection (ESP) system is
installed and the autopilot is on. It is designed to protect the airplane from stalls. When the aircraft reaches a
predetermined airspeed, a yellow MINSPD annunciation will appear above the airspeed indicator.
For airplanes that have ESP installed, the AFCS can detect and protect against underspeed situations while the
autopilot is engaged. It is designed to discourage aircraft operation below minimum commandable airspeeds.
