# Airworthiness Directives; Rolls-Royce Ltd. Dart 511, 511-7E, 514-7, 528, 528-7E, 529-7E, 532-7, 532-7L, 532-7N, 532-7P, 532-7R, 535-7R, 551-7R, and 552-7R Turboprop Engines
> **Rule** · Final rule. · Published 2000-06-26 · Effective 2000-07-31 · 65 FR 39286
## Document
- **Document number:** 00-15424
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 39286
- **Publication date:** 2000-06-26
- **Effective date:** 2000-07-31
- **FAA docket:** Docket No. 99-NE-50-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce Ltd. Dart 511, 511-7E, 514-7, 528, 528-7E, 529-7E, 532-7, 532-7L, 532-7N, 532-7P, 532-7R, 535-7R, 551-7R, and 552- 7R turboprop engines. This AD requires the installation of a feathering probe and a steel retaining ring in the reduction gear housing (RGH) and replacement of a transfer bobbin installed in the torquemeter. This amendment is prompted by two reports of the failure of a propeller to feather following the failure of the RGH annulus gear, which resulted in the propeller overspeeding and the release of a propeller blade, causing damage to the airplane. The actions specified by this AD are intended to prevent a propeller from overspeeding and the release of a propeller blade after a failure of the RGH annulus gear, which could result in damage to an adjacent engine or to the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/06/26/00-15424/airworthiness-directives-rolls-royce-ltd-dart-511-511-7e-514-7-528-528-7e-529-7e-532-7-532-7l-532-7n)
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