AD Amdt-39-9221
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; AlliedSignal Inc. (Formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 Series Turboshaft Engines |
Unsafe Condition
Cracks in the centrifugal compressor impeller can lead to uncontained engine failure, inflight engine shutdown, or damage to the rotorcraft.
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Required Actions
Replace centrifugal compressor impellers exceeding published life limits per the specified schedule. Use new minor cycle counting factors table and prorate past usage. Implement enhanced inspection procedures and eliminate flyback criteria based on crack size.
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Compliance Time
Before further flight
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Affected Aircraft
AlliedSignal Inc. (formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 series 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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