AD 2004-26-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Allison | Engine Company | Airworthiness Directives; Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C Series Turboprop and Turboshaft Engines |
Unsafe Condition
Failure of the compressor adaptor coupling, leading to engine shutdown and loss of all engine power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service affected compressor adaptor couplings manufactured by Alcor, EXTEX, Rolls-Royce Corporation (RRC), and Superior Air Parts (SAP). Replace or machine the coupling and impeller as necessary to achieve the specified fit tolerance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the compliance schedule established by the field management plans of the respective manufacturers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce Corporation (formerly Allison Engine Company, Allison Gas Turbine Division, and Detroit Diesel Allison) 250-B and 250-C series turboprop and turboshaft engines with certain part numbers (P/Ns) of compressor adaptor couplings manufactured by Alcor, EXTEX, RRC, and SAP installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.