AD 2012-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Turbomeca | S | Airworthiness Directives; Turbomeca S.A. Turboshaft Engines |
Unsafe Condition
Dust inside the gas generator hollow shaft may be found when the axial compressor wheel has less erosion than initially assessed, which may lead to an unbalance of the gas generator rotating assembly, deterioration of the gas generator rear bearing, and uncommanded engine shutdown.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine the engine history; perform a one-time visual inspection of the axial compressor for erosion; perform initial and repetitive cleaning of the gas generator hollow shaft; and replace the rear bearing if the amount of dust collected during cleaning exceeds 8 grams.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 engine hours after the effective date of this AD.
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Affected Aircraft
All Turbomeca S.A. Arriel 1A, 1A1, 1A2, 1B, 1C, 1C1, 1C2, 1D, 1D1, 1E2, 1K1, 1S, and 1S1 turboshaft engines that have not incorporated Turbomeca S.A. Modification TU360.
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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