AD 2006-14-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell | International Inc | Airworthiness Directives; Honeywell International Inc. TPE331 Series Turboprop, and TSE331-3U Model Turboshaft Engines |
Unsafe Condition
Uncontained turbine rotor separation due to low-cycle-fatigue (LCF) on engines used in special-use operations.
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Required Actions
Implement a new flight cycle counting method for first, second, and third-stage turbine rotors used in aircraft with multiple takeoffs and landings without engine shutdown. Remove turbine rotors from service if they have reached or exceeded their cycle life limits. Determine total equivalent cycles accrued.
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Compliance Time
Before further flight
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Affected Aircraft
Honeywell International Inc. TPE331 series turboprop and TSE331-3U model turboshaft engines used in aircraft with multiple takeoffs and landings without engine shutdown.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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