FAA consults on NextGen transition from VOR

The Federal Aviation Administration (FAA) is seeking comments on a proposed transition of the US National Airspace System (NAS) navigation infrastructure to enable performance-based navigation (PBN) as part of the Next Generation Air Transportation System (NextGen).
The FAA plans to transition from defining airways, routes and procedures using VHF Omni-directional Range (VOR) and other legacy navigation aids (NAVAIDs) towards a NAS based on Area Navigation (RNAV) everywhere and Required Navigation Performance (RNP) where beneficial.
Such capabilities will be enabled largely by the Global Positioning System (GPS) and the Wide Area Augmentation System (WAAS).
The FAA plans to retain an optimized network of Distance Measuring Equipment (DME) stations and a minimum operational network (MON) of VOR stations to ensure safety and continuous operations for high and low altitude en route airspace over the conterminous US (CONUS) and terminal operations at Core 30 airports.
Core 30 airports are those with significant activity serving major metropolitan areas and also serve as hubs for airline operations, found at http://aspmhelp.faa.gov/index.php/Core_30.
The FAA is also conducting research on Alternate Positioning, Navigation and Timing (APNT) solutions that would enable further reduction of VORs below the MON such as Tactical Air Navigation (TACAN) Azimuth, VOR/TACAN (VORTAC), VOR/DME, Non-Directional Beacon (NDB) operated by the FAA.
In addition, the FAA plans to satisfy any new requirements for Category I instrument operations with WAAS localizer performance with vertical guidance (LPV) procedures.
A network of existing Instrument Landing Systems (ILS) would be sustained to provide alternative approach and landing capabilities to continue recovery and dispatch of aircraft during GPS outages.
This transition would be consistent with the FAA´s NextGen Implementation Plan (NGIP), NAS Enterprise Architecture (EA), and other documentation.
More information is available on the FAA´s NextGen Web site at http://www.faa.gov/nextgen and the EA Web site at https://nasea.faa.gov.

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