Airworthiness Directive · Amendment 39-19248 · Turbine section
Safran Helicopter Engines, S.A., Turboshaft Engines
This AD applies to Safran Helicopter Engines, S.A., Arrius 2B1, 2B1A, 2B2, and 2K1 turboshaft engines with a power turbine wheel (PTW) assembly having a serial number listed in Appendix 2.1 of Safran Helicopter Engines Mandatory Service Bulletin (MSB) No. A319 72 2854, Version A, dated February 9, 2018.
We are adopting a new airworthiness directive (AD) for certain Safran Helicopter Engines, S.A., Arrius 2B1, 2B1A, 2B2, and 2K1 turboshaft engines. This AD requires inspecting the power turbine wheel (PTW) assembly and replacing the PTW if the turbine blade dampers are found missing. This AD was prompted by the manufacturer reporting a number of PTW assemblies may have been assembled without the blade dampers. We are issuing this AD to address the unsafe condition on these products.
Within 20 flight hours or 30 days after the effective date of this AD, whichever occurs first:
(1) Inspect the PTW in accordance with paragraph 2.4.2.3 of Safran Helicopter Engines MSB No. A319 72 2854, Version A, dated February 9, 2018; and
(2) If, as a result of the inspection required by paragraph (g)(1) of this AD, any dampers are found missing, replace the PTW with a part eligible for installation before further flight.
Do not install an engine with a PTW with a serial number listed in Appendix 2.1 of Safran Helicopter Engines MSB A319 72 2854, Version A, dated February 9, 2018, unless all thirty-one blade dampers are installed.
