AD 2012-27-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Gas Generator (GG) rear bearing failures have occurred following Level 3 maintenance actions on the GG rotating assembly, potentially creating an unbalanced condition that could lead to an uncommanded in-flight shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a high gas generator speed (NG) rating vibration check after any Level 3 maintenance action on the gas generator (GG) rotating assembly and before returning the engine to service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of February 14, 2013.
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Affected Aircraft
All Turbomeca S.A. Arriel 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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