AD 2018-07-17
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Safran | Helicopter | Airworthiness Directives; Safran Helicopter Engines, S.A., Turboshaft Engines |
Unsafe Condition
During an ARRIUS 2B2 engine ground run check, the ``Degrade'' indicator illuminated and unusual vibration occurred. At the same time, bluish smoke and debris came out of the exhaust pipe. Both engines were shut down without further occurrences. Investigations at Safran Helicopter Engines revealed that missing dampers on the PTW assembly caused rupture of PTW blades. Further investigations identified a batch of potentially affected PTW.
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Required Actions
Inspecting the power turbine wheel (PTW) assembly and replacing the PTW if the turbine blade dampers are found missing.
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Compliance Time
Within 20 flight hours or 30 days
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Affected Aircraft
Safran Helicopter Engines, Arrius 2B1, 2B1A, 2B2, and 2K1 turboshaft engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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