190-00728-04 Rev. A
Embraer Prodigy® Flight Deck 100 Pilot’s Guide
473
AUTOMATIC FLIGHT CONTROL SYSTEM
NAVIGATION MODES (GPS, VOR, LOC, BC)
NOTE: The selected navigation receiver must have a valid VOR or LOC signal or active GPS course for the
flight director to enter Navigation Mode.
PressingtheNAVKeyselectsNavigationMode.NavigationModeacquiresandtrackstheselectednavigation
source(GPS,VOR,LOC). Theightdirector followsGPSrollsteering commandswhenGPSis theselected
navigationsource.WhenthenavigationsourceisVORorLOC,theightdirectorcreatesrollsteeringcommands
fromtheSelectedCourseanddeviation.NavigationModecanalsobeusedtoynon-precisionGPSandLOC
approacheswhereverticalguidanceisnotrequired.
BackcourseModecapturesandtracksalocalizersignalinthebackcoursedirection.Themodemaybeselected
by pressing the NAV Key.Whenmakingabackcourseapproach,settheSelectedCoursetothelocalizerfront
course. The flight director creates roll steering commands from the Selected Course and deviation.
IftheCourseDeviationIndicator(CDI)showsgreaterthanonedotwhentheNAV Key is pressed, the selected
modeisarmed.IftheCDIislessthanonedot,NavigationModeisautomaticallycapturedwhentheNAV Key
is pressed. The armed annunciation appears in white to the left of the active lateral mode.
Figure 7-26 GPS Navigation Mode Armed
WhentheCDIhas automaticallyswitchedfromGPS toLOCduringa LOC/ILSapproach,GPSNavigation
Moderemainsactive,providingGPSsteeringguidanceuntil thelocalizersignaliscaptured.LOC Navigation
ModeisarmedautomaticallywhenthenavigationsourceswitchtakesplaceiftheAPR Key is not pressed prior
to the automatic source switch.
IfNavigationModeisactiveand eitherofthefollowingoccur,theightdirectorreverts toRollHoldMode
(wings rolled level):
•DifferentVORtunedwhileinVORNavigationMode(VORNavigationModerevertstoarmed)
•Navigationsourcemanuallyswitched(withtheCDI Softkey)
•DuringaLOC/ILSapproach,theFAFcrossedwhilein GPSNavigationModeaftertheautomaticnavigation
sourceswitchfromGPStoLOC
CHANGING THE SELECTED COURSE
IfthenavigationsourceisVORorlocalizerorOBSMode hasbeenenabledwhenusingGPS,theSelected
Course is controlled using the CRS Knob corresponding to the selected flight director (CRS1 for the pilot
side, CRS2 for the copilot side).
Pressingthe CWS Button and hand-flying the aircraft does not change the Selected Course while in
NavigationMode.TheautopilotguidestheaircraftbacktotheSelectedCourse(orGPSightplan)whenthe
CWS Button is released.