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Air transportation safety officials in the US issued an “urgent” recommendation on Wednesday that calls for the redesign of an engine component on some of Boeing’s 777 aircraft. The component has been blamed for two major airline incidents.

Investigators at the National Transportation Safety Board (NTSB) said that a Rolls-Royce engine component was a factor in the January 17, 2008 British Airways 777 crash landing that occurred near Heathrow Airport in London. Both of the jet’s engines lost power as the aircraft was approaching the runway, and as a result of the mishap, 13 people on board were injured.

Later in the year, on November 26, 2008, a Delta Air Lines 777 was flying over Montana when one of its engines lost power. The plane later landed safely at the Atlanta airport, after pilots initiated a procedure that had been developed in response to the crash in the UK.

According to the NTSB, in both instances an ice build-up on a fuel/oil heat exchanger led to the flow of fuel to the engine being restricted, causing the planes to lose power.

“With two of these rollback events occurring within a year, we believe that there is a high probability of something similar happening again,” said Mark Rosenker, the NTSB Acting Chairman, in a news release.

Recently, the Federal Aviation Administration (FAA) ordered airlines operating Boeing 777s with Rolls Royce engines to revise their flight manuals, providing procedures for pilots to follow in certain weather conditions if they note a reduction of power.

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