# Airworthiness Directives; Rolls-Royce plc RB211 Trent 553-61, 553A2-61, 556-61, 556A2-61, 556B-61, 556B2-61, 560-61, and 560A2-61 Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2006-02-01 · Effective 2006-02-16 · 71 FR 5162
## Document
- **Document number:** 06-826
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 71 FR 5162
- **Publication date:** 2006-02-01
- **Effective date:** 2006-02-16
- **FAA docket:** Docket No. FAA-2005-23031
## Abstract

The FAA is adopting a new airworthiness directive (AD) for certain Rolls-Royce plc (RR) RB211 Trent 553-61, 553A2-61, 556-61, 556A2-61, 556B-61, 556B2-61, 560-61, and 560A2-61 turbofan engines. This AD requires initial and repetitive borescope inspections for missing HPT rear seal plate locking plugs and damaged locking plug retaining wires, and removal of the engine from service if necessary, based on inspection results. This AD results from two reports of missing HPT rear seal plate locking plugs, damage to the HPT disc, and damage to the remaining locking plug retaining wires. We are issuing this AD to prevent uncontained release of the HPT rear side plate and HPT disc, resulting in damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/02/01/06-826/airworthiness-directives-rolls-royce-plc-rb211-trent-553-61-553a2-61-556-61-556a2-61-556b-61)
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