A shudder went through the air traffic system on March 20 when the New York Air Route Traffic Control Center shut down briefly after a staff member tested positive for the coronavirus.
In ATC parlance, the facility had gone to “ATC zero” status—an unplanned closing that the existing contingency planning can’t prevent.
Before the coronavirus pandemic and an earthquake in Salt Lake City joined the list this month, equipment failures and natural phenomena like severe weather or flooding were known triggers for ATC facilities going ATC zero. In September 2014 an arson fire shut down the Chicago ARTCC when a reportedly suicidal contract worker lit gasoline-soaked rags near computer equipment in the facility basement. He pleaded guilty to charges in the incident and was sentenced to a 12-year prison term.
ATC-zero events are infrequent (434 systemwide in 2019, according to the FAA). If a portion of a facility is affected by a shutdown, the facility is said to be on “ATC limited” status, as was Indianapolis Center on March 19 in another event triggered by a coronavirus test. Far more common than ATC-zero or ATC-limited events are “ATC Alert” events, which numbered 1,765 in 2019.
The sudden and widespread impact of an ATC-zero scenario underlines the need for general aviation pilots to make regular and repeated checks of notams for airport closures, routing restrictions, and airspace service-level changes. Pilots can check for air traffic delays via the FAA’s ATCSCC website and selecting various products like current advisories.
ATC zero is not a time for taking advantage of the situation and adding to congestion—for example by making touch-and-goes at a busy airport like Midway International Airport in Chicago, a complication the FAA quickly addressed by imposing a temporary flight restriction, noted Rune Duke, AOPA senior director of airspace, air traffic, and aviation security.
As with the coronavirus itself, taking the necessary precautions in flight planning protects not just yourself, but all your fellow users of the airspace system as well.