# Airworthiness Directives; Rolls-Royce Limited Dart Series Turboprop Engines
> **Rule** · Final rule. · Published 1999-12-29 · Effective 2000-02-28 · 64 FR 72918
## Document
- **Document number:** 99-33565
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Limited Dart Series Turboprop
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 72918
- **Publication date:** 1999-12-29
- **Effective date:** 2000-02-28
- **FAA docket:** Docket No. 99-NE-30-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Rolls-Royce Limited Dart series turboprop engines. This amendment requires a one-time visual inspection of the interior of the switch to determine the type of low torque switch, and removal from service of unapproved Klixon low torque switches and replacement with serviceable parts. This amendment is prompted by the discovery of unapproved low torque switches in fleet operation. The actions specified by this AD are intended to prevent possible low torque switch failure, which could result in failure of a propeller to auto-feather following an engine power loss, resulting in possible loss of control of the airplane due to high asymmetric drag.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/12/29/99-33565/airworthiness-directives-rolls-royce-limited-dart-series-turboprop-engines)
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