I can't remember how to get my MD-11 to track a VOR radial while on Autopilot. Can somebody walk me throught it?Thanks,Eric

RAD/NAV page and select the VOR apparently!! Never tried this myself. You have to activate the function. Unable to check right now.Best regards,Robin.

enter the station and course on the NAV RAD page, and press the VOR ARM prompt. That should arm VOR mode on the FMA. Remember, you must be below 18,000ft.Paul

you must be below 18,000ft.

Why is this? Slant range?Best regards,Robin.

Why is this? Slant range?Best regards,Robin.

Robin,It's by design.Can think of some reasons for that:Above 18000 in an IFR environment there are better options in the FMC to fly airways, compared to doing this by VOR/Radial tracking.Below 18000: even then the FMC has many VOR Approach procedures stored to get you where you want, using the NAV mode. But you have the option there to do it by using VOR/Radial tracking.Regarding VOR final approach course:You have the option to fly it using VOR Tracking, but IMHO it's prefered to fly the final VOR/Course RAW data in AP TRK mode, even more so when the VOR is say 2 NM in front of the threshold.Regards,Harry

but IMHO it's prefered to fly the final VOR/Course RAW data in AP TRK mode, even more so when the VOR is say 2 NM in front of the threshold.

Might even be the only legal method (unless it is a gps overlay) because the approach is flight checked and certifed with the raw data, and not all FMS installations are TSO'd for derived VOR approaches (not sure about MD11 .. might have a logic circle here).

Might even be the only legal method (unless it is a gps overlay) because the approach is flight checked and certifed with the raw data, and not all FMS installations are TSO'd for derived VOR approaches (not sure about MD11 .. might have a logic circle here).

Dan,Right,Primary means on the MD11 to monitor non-precision approaches is raw data.The prefered method to fly these non-precisions is, using AP TRK- and FPA-mode. This with the exception of a LOC ONLY approach, where LOC is coupled of course and FPA is used for a decent descent angle.(Sidenote: The MD11 has an alternative for flying HDG and V/S where needed. It's available as TRK and FPA and also the Autopilot is able to follow this commands. These features are also introduced by Boeing starting from the 777.)Regards,Harry