EASA SIB 2019-10R1
Power Turbine Over-Speed Protection on ARRIEL 2D and ARRIEL 2B1 Engines
EASA Safety Information Bulletin 2019-10R1 is an airworthiness bulletin addressing power turbine over-speed protection on ARRIEL 2D and ARRIEL 2B1 engines installed on AS 350 B3 and EC 130 T2/B4 helicopters. It provides information on the design and safety features related to turbine blade shedding to prevent turbine disc burst and introduces electronic over-speed protection via FADEC software and wiring modifications. The bulletin includes references to Airbus Helicopters and SAFRAN service bulletins supporting these modifications.