# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (formerly Rolls-Royce plc) Dart 528, 529, 532, 535, 542, and 552 Series Turboprop Engines
> **Rule** · Final rule. · Published 2007-02-12 · Effective 2007-03-19 · 72 FR 6461
## Document
- **Document number:** E7-1708
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 72 FR 6461
- **Publication date:** 2007-02-12
- **Effective date:** 2007-03-19
- **FAA docket:** Docket No. FAA-2006-25272
## Abstract

The FAA is adopting a new airworthiness directive (AD) for Rolls-Royce Deutschland Ltd & Co KG (formerly Rolls-Royce plc) (RRD) Dart 528, 529, 532, 535, 542, and 552 series turboprop engines. This AD would require repetitive inspections of high pressure turbine (HPT) blade platforms and shrouds, and reworking the engines if the inspections reveal excessive gaps between blade shrouds. This AD results from reports of HPT disk rim failures. We are issuing this AD to prevent HPT disk rim failures resulting in the release of portions of the HPT disk, uncontained engine failure, and damage to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/02/12/E7-1708/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-formerly-rolls-royce-plc-dart-528-529)
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