The one-second outage caused air traffic controllers to delay at least one departure Sunday afternoon.
ABC News obtained the ATC recording where the controller is heard telling other aircraft that there was an equipment failure on the departure frequency and they were holding the aircraft:
"Everybody whose on my frequency and going for departure uhh currently we are stopped on departures. Approach control lost their radar again. I'm not sure how long it's gonna be. Just keep you guys in loop. Let you know more information once we know more information."
The FAA is investigating the cause.
Newark has been plagued with staffing and equipment problems for months.
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