# Proposed AD FAA-2004-19930: Withdrawal - Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Withdrawn
- Products: Rolls-Royce
- Product type: Engine
- Action: Proposed rule; withdrawal.
- Published: March 17, 2006, 71 FR 13787
- Comments due: March 12, 2006
- Docket: FAA-2004-19930 (https://www.regulations.gov/docket/FAA-2004-19930, where comments are filed)
- Project: 2004-NE-33-AD
- FR document: E6-3907
- Official PDF: https://openairdocs.org/files/sha256/7b/83/7b8372f35b78fae53284d086d318b7a814c27a9c58d6908a75baf88bd2d93387 (from https://www.govinfo.gov/content/pkg/FR-2006-03-17/pdf/E6-3907.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/03/17/E6-3907/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/A4A45512384843A586257134005139FD.0001
- Page: https://openairdocs.org/proposed/FAA-2004-19930

## Summary

This action withdraws a notice of proposed rulemaking (NPRM). That NPRM proposed a new airworthiness directive (AD) that applies to Rolls-Royce plc (RR) RB211 Trent 800 series turbofan engines. That proposed action would have required initial and repetitive borescope inspections of the high pressure-and-intermediate pressure (HP-IP) turbine internal and external oil vent tubes for coking and carbon buildup, and cleaning or replacing the vent tubes if necessary. Since we issued that NPRM, RR notified us that the RB211 Trent 800 series turbofan engines are significantly less susceptible to vent tube carbon build-up than the RB211 Trent 700 series turbofan engines. Repeat on-wing inspections therefore, are not required to maintain fleet safety. Accordingly, we withdraw the proposed rule.

## Notices in this docket

- Dec 27, 2004: Notice of proposed rulemaking (NPRM). (first notice), FR document 04-28145, comments due Feb 25, 2005 (https://www.federalregister.gov/documents/2004/12/27/04-28145/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines)
- Mar 17, 2006: Proposed rule; withdrawal., FR document E6-3907, comments due Mar 12, 2006 (https://www.federalregister.gov/documents/2006/03/17/E6-3907/airworthiness-directives-rolls-royce-plc-rb211-trent-800-series-turbofan-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.