Garmin G1000 Pilot’s Guide for Cessna Nav III
190-00498-07 Rev. A
434
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE
AFCS
ADDITIONAL
FEATURES
APPENDICESINDEX
COMMAND BARS
Uponactivationoftheightdirector,CommandBarsaredisplayedonthePFDasasinglemagentacue.The
CommandBarsmove togetherverticallyto indicatepitchcommands, andbankleft orrightto indicateroll
commands.TheCommandBarsdonotoverridetheaircraftsymbol.
Iftheattitudeinformationsenttotheightdirectorbecomes invalidorunavailable,theCommandBarsare
removedfromthedisplay.TheightdirectorCommandBarsalsodisappearif thepitchexceeds+30˚/-20˚or
bankexceeds65˚.
Figure 7-3 Command Bars
Aircraft Symbol
Command Bars
FLIGHT DIRECTOR MODES
Flightdirector modes are normally selected independently for the pitch and rollaxes.  Unless other wise
specified, all mode keys are alternate action (i.e., press on, press off). In the absence of specific mode selection,
theightdirectorrevertstothedefaultpitchand/orrollmodes(s).
ArmedmodesareannunciatedinwhiteandactiveingreenintheAFCSStatusBox.Undernormaloperation
whenthecontrolfortheactiveightdirectormodeispressed,theightdirectorrevertstothedefaultmodes(s)
forthe axis(es).  Automatic transition from armed to active mode is indicated by the white armed mode
annunciationmovingtothegreenactivemodeeldandashingfor10seconds.
Ifthe information required to compute a ight director mode becomes invalid or unavailable, the ight
directorautomatically revertstothe defaultmode forthat axis.A ashingyellow modeannunciation and
annunciatorlightindicatelossofsensor(ADC)ornavigationdata(VOR,LOC,GPS,SBAS)requiredtocompute
commands.Whensuchalossoccurs,thesystemautomaticallybeginstorollthewingslevel(entersRollHold
Mode)ormaintain thepitchangle (entersPitchHold Mode),dependingon theaffectedaxis. Theashing
annunciationstopswhentheaffectedmodekeyispressedoranothermodefortheaxisisselected.Ifafter10
secondsnoactionistaken,theashingannunciationstops.
Figure 7-4 Loss of VOR Signal
Theightdirectorisautomaticallydisablediftheattitudeinformationrequiredtocomputethedefaultight
director modes becomes invalid or unavailable.