AD 95-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T5313B | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 Series Turboshaft Engines |
| engine | Honeywell International Inc. | T5317A | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 Series Turboshaft Engines |
| engine | Honeywell International Inc. | T5317A-1 | Airworthiness Directives; AlliedSignal Inc. (formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 Series Turboshaft Engines |
| engine | Honeywell International Inc. | T5317B | 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 pressure equalization holes due to insufficient minor cycle counting factors for cyclic computation, leading to low cycle fatigue (LCF) failure and uncontained engine failure, inflight shutdown, or rotorcraft damage.
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Required Actions
Utilize a new minor cycle counting factors table, prorate past centrifugal compressor impeller usage based on the new table, perform enhanced inspections per SB T5313B/17-0052, and remove engines with time-expired impellers per the schedule in SB T5313B/17-0020.
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Compliance Time
Effective May 25, 1995
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Affected Aircraft
AlliedSignal Inc. (formerly Textron Lycoming and Avco Lycoming) Model T5313B and T5317 series turboshaft engines, installed on but not limited to Bell 205 series rotorcraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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