Iberia is investigating the cause of an in-flight shutdown involving a Rolls-Royce Trent XWB engine on one of the Spanish flag carrier's Airbus A350s.

The IAG-owned airline says the twinjet – en route from New York to Madrid on 11 September – diverted to Boston after an "engine failure" about 90min into the flight and landed without further incident.

FlightGlobal understands that the pilots shut down the engine, and that the incident was the second in-flight shutdown of a Trent XWB engine. The first incident had been caused by an engine sensor malfunction.

Iberia took delivery of its first A350 in June, and has since received a second aircraft of the type, Flight Fleets Analyzer shows. The airline has another 14 A350s on order.

Rolls-Royce says it "will be working closely with the airline to support them".

The UK engine maker describes the Trent XWB as having "enjoyed the smoothest entry into service of any widebody engine", adding: "We continue to see the engine achieving market-leading levels of reliability."

Flight Fleets Analyzer shows that 188 A350s have been delivered since service entry with Qatar Airways in 2015.

Source: Cirium Dashboard