European regulators have pinpointed a potentially flawed cleaning process during maintenance as investigators probe an engine fire that caused a Cathay Pacific Airbus jet carrying 348 people to turn back to base.

European regulators have widened the number of Rolls-Royce Trent engines affected by a potential fuel hose defect, in an updated directive issued 19 September following an engine fire on a Cathay Pacific Airbus A350-1000.