AD 94-02-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell International Inc. | T5508D | Airworthiness Directives; Textron Lycoming Model T5508D Turboshaft Engines |
Unsafe Condition
Impeller low cycle fatigue (LCF) crack initiation and propagation in the aft face cooling air holes can lead to uncontained impeller failure.
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Required Actions
Conduct a revised impeller operating cycle count using SB T5508D-0002, replace impellers exceeding 8,000 cycles in service (CIS) per drawdown requirements in SB T5508D-0040, and life limit impellers to 8,000 CIS.
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Compliance Time
Within 7 days after the effective date of this AD, and prior to further flight for impellers with 8,000 or more CIS not installed on the effective date.
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Affected Aircraft
Textron Lycoming Model T5508D turboshaft engines, installed on but not limited to Bell 214B helicopters, part numbers 2-100-180-13 and 2-100-180-19.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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