The off-duty pilot asked staff why the flight was being diverted before pointing out he was qualified pilot and offering his services.
The German passenger then helped to land the plane in an emergency landing at Dublin airport.
A Lufthansa spokeswoman said: “In such circumstances it’s absolutely normal procedure for the pilot, the flight captain, to continue to operate the aircraft.
“Also, where necessary, the cabin crew are fully trained and can be called upon to read checklists back to the pilot. The procedures are in place for such an eventuality. “
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