# Proposed AD FAA-2009-1369: Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-21-09
- Products: Rolls-Royce
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 27, 2009, 74 FR 19025
- Comments due: June 26, 2009
- Became: [AD 2009-21-09](https://openairdocs.org/ad/2009-21-09)
- Docket: FAA-2009-1369 (https://www.regulations.gov/docket/FAA-2009-1369, where comments are filed)
- Project: 2003-NE-03-AD
- FR document: E9-9479
- Official PDF: https://openairdocs.org/files/sha256/bb/e6/bbe66a1aaa2055f27e0847239c77546f693c3cc08cdf5aa2b171e677ba4cbcac (from https://www.govinfo.gov/content/pkg/FR-2009-04-27/pdf/E9-9479.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/04/27/E9-9479/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/90FB40F8125513A5862575A500702A1C.0001
- Page: https://openairdocs.org/proposed/FAA-2009-1369

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for Rolls-Royce plc RB211 Trent 875-17, Trent 877-17, Trent 884-17, Trent 892-17, Trent 892B-17, and Trent 895-17 turbofan engines with high pressure (HP) compressor rotor rear stage 5 and 6 discs and cone shafts, part numbers (P/Ns) FK25230 and FK27899 installed. This proposed AD would require removing these parts at new reduced cycle limits. This proposed AD results from Rolls-Royce plc reducing the lives of these parts and changing the life calculating method to use ``Standard Duty Cycles'' with ``Multiple Flight Profile Monitoring'' and ``Flight Cycles'' with ``Heavy Flight Profile Monitoring''. We are proposing this AD to prevent stage 5 and 6 disc crack initiation and propagation that might lead to uncontained disc failure and damage to the airplane.

## Notices in this docket

- Apr 27, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-9479, comments due Jun 26, 2009 (https://www.federalregister.gov/documents/2009/04/27/E9-9479/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines)

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