FAA provided another update on its plans to reduce the VOR network at the October 2018 meeting of the Aeronautical Charting Meeting. The latest Very High Frequency Omnidirectional Range (VOR) Minimum Operational Network (MON) Program update (PDF) includes the following key details:
- 311 VORs (about 30 percent) will be shut down by 2025
- 585 VORs will remain operational
- Most of the VORs to be deactivated are in the East (133) and Central (163) regions; in the West, only 15 navaids are on the list to be turned off.
- As of September 2018, 34 VORs, VOR/DME, and VORTACs have been shut down.
- At the end of 2018, 34 of the 74 Phase 1 VORs have been shut down.
- FAA plans to enhance the service volume of remaining VORs from 40 nm to 70 nm beginning at 5000 AGL. The enhanced VORs will be classified as VOR Low (VL) and VOR High (VH). Documents such as the AIM will be updated as the enhancement program gets underway. The illustration below shows the coverage that the enhanced VORs will provide at or above 5000 AGL.
As I’ve noted in several previous posts (e.g., here), the VOR MON program is designed to provide backup to GNSS (GPS). Specifically, within the contiguous United States the MON program will support conventional navigation in the event of a GPS outage by ensuring that pilots can:
- Tune and identify a VOR at an altitude of 5,000 feet above site level and higher
- Conduct VOR navigation through a GPS outage area
- Navigate to a MON airport within 100 nautical miles to fly an Instrument
Landing System (ILS), Localizer (LOC) or VOR instrument approach without
GPS, DME, Automatic Direction Finder (ADF), or radar
- Navigate along VOR Airways, especially in mountainous terrain, where
Minimum En-route Altitudes (MEAs) make direct-to navigation impracticable
MON airports (i.e., those with conventional instrument procedures as described above) will be identified on en route charts, FAA Chart Supplements, and included in the National Airspace System Resource (NASR) Subscriber File data set for developers of electronic charts, apps, and so forth.
The FAA’s detailed policy for the transition was outlined in the Federal Register, here. More information about the program to reduce the VOR neworks is available at AOPA, here.
Here’s the list of next round of VORs scheduled to be shut down. I have provided links to the navaids at SkyVector.com so that you can see each location on a sectional chart. Note that in each case, several nearby VORs will remain in service:
BUU (BURBUN) Burlington, WI – Nov. 8, 2018
RUT (RUTLAND) Rutland, VT – Nov. 8 2018
VNN (MT VERNON) Vernon, IL – Nov. 8, 2018
TVT (TIVERTON) Tiverton, OH – Nov. 8, 2018
CSX (CARDINAL) St. Louis, MO – Jan. 3, 2019
ISQ (SCHOOLCRAFT CO) Manistique, MI – Jan. 3, 2019
MTO (MATTOON) Mattoon, IL – Jan. 3, 2019
ORD (CHICAGO O’HARE) Chicago, IL – Jan. 3, 2019
RID (RICHMOND) Richmond, IN – Jan. 3, 2019
FRM (FAIRMOUNT) Fairmont, MN – Feb. 28, 2019
GNP (GLENPOOL) Tulsa, OK – Feb. 28, 2019
LSE (LA CROSSE) La Crosse WI – Feb. 28, 2019
MTW (MANITOWOC) Manitowoc, WI – Feb. 28, 2019
GTH (GUTHERIE) Guthrie, TX – Apr. 25, 2019
HUB (HOBBY) Hobby, TX – Apr. 25
CZQ (CLOVIS) Clovis, in Fresno, CA – Apr. 25, 2019