# Airworthiness Directives; Rolls-Royce plc 524 Series and Trent 768-60 and 772-60 Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2000-03-08 · Effective 2000-04-07 · 65 FR 12084
## Document
- **Document number:** 00-4929
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc 524 Series and Trent 768-60 and 772-60 Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 65 FR 12084
- **Publication date:** 2000-03-08
- **Effective date:** 2000-04-07
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce plc (RR) RB211-524G2-T-19; RB211-524G3-T- 19; RB211-524H2-T-19; RB211 Trent 768-60; and RB211 Trent 772-60 turbofan engines. This AD requires the replacement of the joint bolt assemblies that secure the high-pressure compressor (HPC) to the high- pressure turbine (HPT) of the RB211-524 series and Trent 768 and 772 series turbofan engines. This amendment is prompted by six incidents of bolt failure, one of which resulted in a damaged stage 6 HPC disk following an impact with a separated bolt head. The actions specified in this AD are intended to prevent failure of the HPC-to-HPT joint bolt assemblies, which could result in a cracked stage 6 HPC disk, possible uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/03/08/00-4929/airworthiness-directives-rolls-royce-plc-524-series-and-trent-768-60-and-772-60-turbofan-engines)
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