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Published 2018-07-12 · Federal Register document 2018-14801

Airworthiness Directives; Rolls-Royce Corporation Turboshaft Engines

Publication summary

We are adopting a new airworthiness directive (AD) for certain Rolls-Royce Corporation (RRC) model 250-C turboshaft engines. This AD was prompted by several reports of engine power loss, one of which resulted in a fatal helicopter accident. This AD requires removal of the power turbine governor (PTG) bearing assembly, part number (P/N) 2544198, and its replacement with a bearing assembly eligible for installation. We are issuing this AD to address the unsafe condition on these products.

Why this record is shown

Source: Federal Register annual FAA metadata. Acquired 2026-09-03T22:23:58.123663+00:00. The title, summary and date are source facts.

Source revision
federal_register_ad_metadata_2018-258c65fa72d503e0
Source row
results[186]
Raw source SHA-256
258c65fa72d503e0b0dfb928a28beb1793ddc7dd9218bce0413e53dfe11d78fb

Publication clauses unresolved

Complete source text is unavailable for structured observation. Use the complete recorded text or official source; no clean result has been inferred.

These are observations from one dated publication. Current legal status is unknown; aircraft applicability, installed configuration, compliance and burden require separate evidence. Missing or unparsed conditions remain unknown.

Official publication text unavailable

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Coverage and limits

These are dated publication metadata, recorded clauses and literal source observations. Word, model-label, header and reference matches do not establish current legal effect, manufacturer/model identity, aircraft applicability, installed configuration or compliance.

The collection uses 33 explicit annual source snapshots. Source captures and operative-text qualifications have separate states. Missing information remains unknown.