Embraer Prodigy® Flight Deck 100 Pilot’s Guide
190-00728-04 Rev. A
476
AUTOMATIC FLIGHT CONTROL SYSTEM
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):
•Vectors-to-Finalisactivated
•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
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
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.