LOUISVILLE, Ky. (AP) — A repeating bell sounded in the cockpit for 25 seconds as pilots tried to control a UPS cargo plane that caught fire, had an engine fall off and crashed during takeoff this week in Louisville, Kentucky, a National Transportation Safety Board member said Friday.

The cockpit voice recorder captured a persistent bell that began about 37 seconds after the crew called for takeoff thrust, and and the bell continued until the recording ended, which investigators believe was the final point of impact, NTSB member Todd Inman said.

Inman said there could be different types of alarms with varying meanings, but investigators know there was a fire in the plane's left wing and will use flight data to help determine a clearer picture of what happened.

The crash Tuesday at UPS Worldport, the company’s global aviation hub in Louisville, killed 13 people, including the three pilots on board.

The NTSB is leading the investigation. Inman said it would be months before the transcript of the cockpit recording is made public as part of that investigation process.

Jeff Guzzetti, a former federal crash investigator, said the bell likely was signaling the engine fire.

“It occurred at a point in the takeoff where they were likely past their decision speed to abort the takeoff,” Guzzetti told The Associated Press after Inman’s news conference Friday. “They were likely past their critical decision speed to remain on the runway and stop safely. … They’ll need to thoroughly investigate the options the crew may or may not have had.”

Dramatic video captured the aircraft crashing into businesses and erupting in a fireball. Footage from phones, cars and security cameras has given investigators visual evidence of what happened from many different angles.

Copyright 2025 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.