A while ago (Summer 2020) I was walking near MAN airport (UK) and saw a 757 taking off. There was a peculiar event during takeoff and I'd love to know what it was.
Once airborne at about 1000 feet (complete guess) its starboard engine started showing flashing rings of flames and there was a loud repeating banging sound for about 20-30 seconds. The plane continued to climb up to several thousand feet.
While watching this I opened FlightRadar and saw that the flight's destination was also MAN.
Over the next 30 minutes or so the plane did a few laps and presumably came back to land.
I'd love to know what this event might have been?