AD 2018-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | Corporation | Airworthiness Directives; Rolls-Royce Corporation Turboshaft Engines |
Unsafe Condition
Reports of engine power loss, one of which resulted in a fatal helicopter accident, due to failure of the power turbine governor (PTG) bearing assembly, part number (P/N) 2544198, due to the lack of lubrication.
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Required Actions
Remove the power turbine governor (PTG) bearing assembly, part number (P/N) 2544198, and replace it with a bearing assembly eligible for installation, as specified in the related service information.
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Compliance Time
Before further flight
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Affected Aircraft
Rolls-Royce Corporation model 250-C turboshaft engines with bearing assembly, part number (P/N) 2544198, installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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