F.A.A. Will Require More Rest for Air Traffic Controllers

The Federal Aviation Administration said on Friday that it was taking significant steps to mitigate the risks posed by exhaustion among air traffic controllers, after a series of close calls last year raised alarms about the safety of the U.S. air travel system.

Mike Whitaker, the F.A.A. administrator, issued a directive increasing the number of hours that controllers are required to rest between shifts from nine hours to 10, and 12 hours before a midnight shift. He said he hoped to put the changes in place within 90 days.

The announcement came as the air safety regulator released a 114-page report from an expert panel that assessed the risks associated with air traffic controller fatigue.

“We are committed to a sustained effort to address controller fatigue and ensure our airspace is the safest in the world,” Mr. Whitaker said in a statement.

The F.A.A. established the panel in December in the wake of a New York Times investigation that revealed how a nationwide shortage of air traffic controllers had resulted in an exhausted and demoralized work force that was increasingly prone to making dangerous mistakes. Many air traffic controllers were working round-the-clock schedules that had pushed them to the psychological and physical brink.

The Times reported that virtually all of the nation’s air traffic control sites were understaffed, forcing many controllers to work 10-hour days, six days a week.