A Ryanair passenger plane landed safely at Stansted Airport in Essex on Monday afternoon after sending a mayday message to flight controllers.
The Boeing 737-200 with between 100 and 150 passengers and crew on board, landed at 1425 BST.
A spokesman for Stansted Airport told BBC News Online the aircrew had reported a suspected engine problem.
The plane had taken off from Luton Airport and was bound for Dublin.
No one was hurt in the incident.
Flights at Stansted were delayed until 1600 because of the unscheduled landing.