# Airworthiness Directives; Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 Propeller Assemblies
> **Rule** · Final rule; request for comments. · Published 2005-12-12 · Effective 2005-12-27 · 70 FR 73364
## Document
- **Document number:** 05-23826
- **Category:** airworthiness
- **Manufacturer:** Dowty
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 73364
- **Publication date:** 2005-12-12
- **Effective date:** 2005-12-27
- **FAA docket:** Docket No. 2001-NE-50-AD
## Abstract

The FAA is superseding an existing airworthiness directive (AD) for Dowty Propellers Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82- F/12, and R334/4-82-F/13 propeller assemblies. That AD currently requires initial and repetitive ultrasonic inspections of propeller hubs, part number (P/N) 660709201. This AD requires the same initial and repetitive ultrasonic inspections, but makes some needed corrections. This AD results from comments received on AD 2005-20-12. We are issuing this AD to prevent propeller hub failure due to cracks in the hub, which could result in loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2005/12/12/05-23826/airworthiness-directives-dowty-propellers-type-r3214-82-f8-r3244-82-f9-r3334-82-f12-and-r3344-82-f13)
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