UK safety branch calls for clearer S76 torque guide

摘要

Operators of Sikorsky S76C++ helicopters may be unaware of overtorque incidents because of an anomaly in existing documentation about the aircraft's flight data recorders, according to the UK Air Accidents Investigation Branch. This fact emerged from an AAIB investigation into a 3 May incident involving significant overtorque during an emergency go-around manoeuvre, but the operator's examination did not detect this because an anomaly in the FDR guidance led to the use of the wrong conversion factors when rendering the recorded data into engineering units.