# Airworthiness Directives; Dowty Aerospace 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. · Published 2004-06-22 · Effective 2004-07-27 · 69 FR 34560
## Document
- **Document number:** 04-13773
- **Category:** airworthiness
- **Manufacturer:** Dowty Aerospace
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 69 FR 34560
- **Publication date:** 2004-06-22
- **Effective date:** 2004-07-27
- **FAA docket:** Docket No. 2001-NE-50-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD) that applies to Dowty Aerospace Propellers (Dowty) Type R334/4-82- F/13 propeller assemblies. That AD currently requires a one-time ultrasonic inspection of propeller hubs, part number (P/N) 660709201, for cracks. This amendment requires initial and repetitive ultrasonic inspections of propeller hubs, P/N 660709201, that are installed on airplanes, and for hubs and propellers in storage, initial ultrasonic inspection of propeller hubs before placing in service. Propeller hubs, P/N 660709201, are installed on Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/13 propeller assemblies. This amendment results from the manufacturer's reevaluation of potential hub failure on Type R321/4-82-F/8, R324/4-82-F/9, R333/4-82-F/12, and R334/4-82-F/ 13 propeller assemblies. 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/2004/06/22/04-13773/airworthiness-directives-dowty-aerospace-propellers-type-r3214-82-f8-r3244-82-f9-r3334-82-f12-and)
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