BA139 - Incident: British Airways B772 near Skopje on Apr 11th 2021

A British Airways Boeing 777-200, registration G-YMMA performing flight BA-139 from London Heathrow,EN (UK) to Mumbai (India), was enroute at FL370 about 30nm south of Skopje (Macedonia) when the crew decided to return to London advising ATC they had a weather radar failure they couldn't continue with, it was not an emergency. The flight could not continue due to the failure of both weather radar systems and the rejection of their flight without at least one working weather radar by Saudi Arabia ahead on their route. The aircraft climbed to FL380 and returned to London for a safe landing about 2:45 hours after turning around.

A replacement Boeing 777-200 registration G-YMMT reached Mumbai with a delay of about 9 hours.

The occurrence aircraft remained on the ground for about 19.5 hours, then performed the next day's flight BA-139 to Mumbai.