LONDON—The U.K. defense ministry is mulling the addition of a bifilar rotorhead system to some of its remaining Westland Sea King helicopters to reduce the effects of vibration on the airframes. Details of the project were revealed by officials at the annual Sea King Symposium, held in Halifax, Canada, in mid-September but have only come to light in recent days. The project has emerged as the U.K. begins a drawdown of the Sea King helicopter fleet. The U.K. defense ministry operates ...


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