According to the Daily Mail, a TAP flight from Lisbon to London Heathrow was diverted to Porto due to a “strange noise.”

The same media outlet states that the ramp officer servicing the TAP Airbus A321 forgot the headphones plugged into the aircraft’s nose gear. According to the information released, an inspection was carried out to confirm that the headphones had fallen off, but apparently, there were no remains of them.

As a precautionary measure, the pilots decided to land in Porto, where the headphones were found still attached to the aeroplane’s gear.