Engine analysis and fire evidence guide probe into Sarawak helicopter crash

On September 8 a Flying Doctor Service Bo-105 helicopter carrying five people went down near Long Lellang STOLport in Sarawak, resulting in total fatalities. The Air Accidents Investigation Bureau’s initial findings ruled out defects in the airframe, maintenance procedures or pilot error, and dispatched the aircraft’s two Rolls-Royce 250-C20B engines—built in 1989 and 1976—to the manufacturer for deeper inspection. Associate Professor Major Dr Mohd Harridon Mohamed Suffian explained that dismantling the engines and scrutinising wear patterns, as well as analysing scorch marks and chemical residues on the rear gearbox, are standard steps to trace the sequence of a fire that was observed near the gearbox in the final moments.

He noted that the rear section houses critical systems such as fuel, hydraulic lines and the transmission, so understanding how the fire spread is vital to assess its impact on flight controls and structural integrity. Transport Minister Anthony Loke indicated that the comprehensive investigation report should be released within a year. The ongoing analysis aims to clarify whether an in-flight fire triggered the crash.