AD 2012-08-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Geometric non-conformities on power turbine (PT) blade fir-tree roots could lead to PT blade rupture, resulting in an uncommanded in-flight engine shutdown, forced autorotation landing, or accident.
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Required Actions
Replace the affected PT blades with eligible blades, replace the M04 module with one having eligible PT blades, or replace the PT wheel assembly with one having eligible PT blades. Guidance is provided in Turbomeca S.A. Alert Mandatory Service Bulletin No. A292 72 2842, Version A.
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Compliance Time
Within 5,000 flight cycles-since-new (CSN) on the PT blades, or within one month after the effective date of this AD, whichever occurs later.
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Affected Aircraft
Turbomeca S.A. Arriel 2B and 2B1 turboshaft engines with PT blade part number 2 292 81 A01 0, serial numbers 102782 through 120230 inclusive, or 120293 through 120390 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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