AD 2012-18-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Rupture of a gas generator (GG) turbine blade, which could result in an uncommanded in-flight shutdown and a forced landing or accident.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Accomplish the TU166 modification in accordance with specified Turbomeca Alert Mandatory Service Bulletins (MSBs) when the GG Turbine is replaced or when the engine or Module M03 is overhauled or repaired, or within specified compliance times after the effective date of this AD, whichever occurs first.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Varies by engine model: 676 cycles-in-service (CIS) for Arriel 2B and 2B1, 500 CIS for Arriel 2S2, and 650 engine hours for Arriel 2C2.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Turbomeca S.A. Arriel 2B, 2B1, 2S2, and 2C2 turboshaft engines not modified by the TU166 modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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