MD83FO
What Night stop has stated is correct. For RNAV GPS approach two navigation systems must be operative i.e. two FMGS and two GPS sensors. VOR DME managed approach only requires GPS primary or NAV ACC high and the conventional radio NAV aid must be available and monitored during approach and must be considered with altitude as the primary means of navigation. In other words for managed VORDME there is no mandatory requirement of GPS.
Last edited by vilas; 18th May 2013 at 10:31.