190-00498-07 Rev. A
Garmin G1000 Pilot’s Guide for Cessna Nav III
457
AUTOMATIC FLIGHT CONTROL SYSTEM
SYSTEM
OVERVIEW
FLIGHT
INSTRUMENTS EIS AUDIO PANEL
& CNS
FLIGHT
MANAGEMENT
HAZARD
AVOIDANCE AFCS ADDITIONAL
FEATURES APPENDICES INDEX
LOCApproachModeallowstheautopilottoyaLOC/ILSapproachwithaglideslope.WhenLOCApproach
Modeis armed,Glideslope Modeis alsoarmed automatically.LOCcaptures areinhibited ifthe difference
betweenaircraftheadingandlocalizercourseexceeds105°.
Selecting LOC Approach Mode:
1) Ensure a valid localizer frequency is tuned.
2) Ensure that LOC is the selected navigation source (use the CDI Softkey to cycle through navigation sources if
necessary).
3) Press the APR Key.
Or:
1) Ensure that GPS is the selected navigation source (use the CDI Softkey to cycle through navigation sources if
necessary).
2) Ensure a LOC/ILS approach is loaded into the active flight plan.
3) Ensure the corresponding LOC frequency is tuned.
4) Press the APR Key.
Ifthefollowingoccurs,theightdirectorrevertstoRollHoldMode(wingsrolledlevel):
•ApproachModeisactiveandaVectors-To-Finalisactivated
•ApproachModeisactiveandNavigationsourceismanuallyswitched
•During a LOC/ILS ApproachGPS Navigation Mode is active and the FAF is crossed after the automatic
navigationsourceswitchfromGPStoLOC
CHANGING THE SELECTED COURSE
The Selected Course is controlled using the CRSKnob(whileinVOR,LOC,orOBSMode).Pressingthe
CWSButtonand hand-yingthe aircraftdoes notchange theSelected Coursewhile inApproachMode.
Theautopilotguidestheaircraftback totheSelectedCourse(or GPSightplan)whentheCWS Buttonis
released.
INTERCEPTING AND FLYING A DME ARC
TheAFCS will intercept and track a DME arc that is part of the active ight plan provided that GPS
NavigationModeisengaged, GPSistheactive navigationsourceonthe CDI,andthe DMEarcsegmentis
theactiveight planleg. Itisimportant tonotethat automaticnavigation ofDMEarcs isbasedon GPS.
Thus,eveniftheAPRkeyispressedandLOCorVORApproachModeisarmedpriortoreachingtheInitial
ApproachFix(IAF),ApproachModewillnotactivateuntilthearcsegmentiscompleted.
If the pilot decides to intercept the arc at a location other than the published IAF (i.e. ATC provides vectors
tointerceptthearc)andsubsequentlyselectsHeadingModeor RollMode,theAFCSwillnotautomatically
interceptortrack thearcunless thepilotactivates thearc legofthe ightplanand armsGPS Navigation
Mode.TheAFCSwillnotinterceptandyaDMEarcbeforereachinganIAFthatdenesthebeginningofthe
arcsegment.Likewise,ifatanypoint whileestablishedontheDMEarcthepilot deselectsGPSNavigation
Mode,theAFCSwillnolongertrackthearc.