# Proposed AD FAA-2008-1165: Rolls-Royce plc RB211-Trent 800 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-10-04
- Products: Rolls-Royce
- Product type: Engine
- Action: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period.
- Published: October 4, 2010, 75 FR 61114
- Comments due: November 18, 2010
- Became: [AD 2011-10-04](https://openairdocs.org/ad/2011-10-04)
- Docket: FAA-2008-1165 (https://www.regulations.gov/docket/FAA-2008-1165, where comments are filed)
- Project: 2008-NE-38-AD
- FR document: 2010-24745
- Official PDF: https://openairdocs.org/files/sha256/69/dc/69dc21a4dfe6ea6903c206d13f1fbef279d9f76ce5b91a00142ac69998aae1ff (from https://www.govinfo.gov/content/pkg/FR-2010-10-04/pdf/2010-24745.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/10/04/2010-24745/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/137477806023AC96862577B20048E5F6.0001
- Page: https://openairdocs.org/proposed/FAA-2008-1165

## Summary

This supplemental NPRM revises an earlier proposed airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

During manufacture of high-pressure (HP) compressor stage 1 discs, a small number of parts have been rejected due to a machining defect that was found during inspection. Analysis of the possibility of less severe examples having been undetected and passed into service has concluded that action is required to reduce the risk of failure. It was therefore necessary to reduce the life limit.

The HP compressor stage 1 disc is part of the HP compressor stage 1-4 shaft, part number (P/N) FK32580. We are proposing this AD to prevent failure of the HP compressor stage 1 disc, uncontained engine failure, and damage to the airplane.

## Notices in this docket

- Feb 18, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-3358, comments due Mar 20, 2009 (https://www.federalregister.gov/documents/2009/02/18/E9-3358/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines)
- Oct 4, 2010: Supplemental notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-24745, comments due Nov 18, 2010 (https://www.federalregister.gov/documents/2010/10/04/2010-24745/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines)

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