The US Federal Aviation Administration (FAA) issued emergency ground stops for multiple airports in the Washington, D.C. region after the Potomac Consolidated Terminal Radar Approach Control (TRACON) in Warrenton, Virginia, was evacuated and declared “ATC Zero,” CNN reported.
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What is ATC Zero?
ATC Zero is an aviation term used when an air traffic control facility is unable to provide services due to staffing shortages, emergencies, or evacuations.
In such situations, all inbound and outbound air traffic is halted or severely restricted. This is when nearby facilities may attempt to take over limited operations where possible.
ATC Zero events are rare but can cause widespread ripple effects across the national airspace system, especially when they involve high-density regions like Washington, D.C.
Ground stops are a standard FAA response in these scenarios, ensuring aircraft are not sent into airspace that cannot be actively managed.
What caused the ATC Zero, and when will its function resume?
At Potomac Tracon, the FAA alerts cite "environmental" as the cause of the Potomac Tracon. According to CNN, the facility is in charge of 20,000 square miles of some of the most complicated airspace in the nation.
{{/usCountry}}At Potomac Tracon, the FAA alerts cite "environmental" as the cause of the Potomac Tracon. According to CNN, the facility is in charge of 20,000 square miles of some of the most complicated airspace in the nation.
{{/usCountry}}Authorities had to clear the area after reports of a chemical odor within the building. This prompted the evacuation of the building, per the FAA.
Aircraft have been grounded since. Currently, flights are being rerouted away from BWI.
According to the FAA, the ground stops began at 6:30 p.m. ET and are set to conclude at 8:00 p.m. DCA is scheduled to resume at 8:30 p.m.
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List of airports affected
The FAA’s ground stop orders impacted major airports across the region, including:
- Ronald Reagan Washington National Airport (DCA)
- Washington Dulles International Airport (IAD)
- Baltimore/Washington International Thurgood Marshall Airport (BWI)
- Richmond International Airport
- Charlottesville-Albemarle Airport
This happened a second time in a month
The vital radar center managing airspace over Washington, DC, has been evacuated twice this month. The incident has since been connected to the evacuation, while earlier FAA systems had referred to it as an "unknown operational problem."
The disruption was like this; was also classified by the FAA under "OCL," or Operational Contingency Level, a status used when air traffic control services are scaled back because of technical difficulties or crises.