Experts have warned the fault that caused a British airways jet to crash land at Heathrow last year could recur.The National Transportation Safety Board in the US has called for the replacement of the engine part, which tests show caused the accident. Manufacturer Rolls Royce says it will be ready in about a year. In the meantime, pilots have adopted new ways of flying the Boeing 777 planes to reduce the likelihood of the problem recurring. Aviation analyst, Chris Yates, said he didn’t believe safety would be compromised as a result: “The National Transportation Safety Board in the United States and the Air Accident Investigation Branch here in the UK are amongst the best in the world.” “They have vast experience of dealing with these issues and the recommendations that they’ve made are appropriate to what we saw at London Heathrow,” he said. There are currently 220 Boeing 777s in operation in the world, owned by BA and 11 other airlines. The NTSB warns it is not known how much the new operating procedures will reduce the risk of the fault But the British and US authorities have decided not to ground the planes.