# Airworthiness Directives; Rolls-Royce plc (RR) RB211 Trent 500 Series Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2008-05-30 · Effective 2008-07-07 · 73 FR 31017
## Document
- **Document number:** E8-11946
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc (RR) RB211 Trent 500 Series Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 73 FR 31017
- **Publication date:** 2008-05-30
- **Effective date:** 2008-07-07
- **FAA docket:** Docket No. FAA-2007-27955
## Abstract

The FAA is superseding an existing airworthiness directive (AD) for RR RB211 Trent 553-61, 553A2-61, 556-61, 556A2-61, 556B-61, 556B2-61, 560-61, and 560A2-61 turbofan engines. That AD currently requires removing certain serial-numbered intermediate pressure compressor (IPC) drums, part number (P/N) FK30102. This AD requires removing those same IPC drums, and requires a new reduced life limit for all other IPC drums, P/N FK30102. This AD results from an RR engineering assessment that it is necessary to reduce the cyclic lives of the other drums with the same P/N. We are issuing this AD to prevent uncontained loss of IPC stage 1 blades, which could result in damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2008/05/30/E8-11946/airworthiness-directives-rolls-royce-plc-rr-rb211-trent-500-series-turbofan-engines)
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