# 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; request for comments. · Published 2005-10-13 · Effective 2005-10-28 · 70 FR 59647
## Document
- **Document number:** 05-20170
- **Category:** airworthiness
- **Manufacturer:** Dowty Aerospace
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 70 FR 59647
- **Publication date:** 2005-10-13
- **Effective date:** 2005-10-28
- **FAA docket:** Docket No. 2001-NE-50-AD
## Abstract

The FAA is superseding an existing airworthiness directive (AD) for 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 reduces the initial and repetitive compliance times for Type R334/4-82-F/13 propeller assemblies when used on Construcciones Aeronauticas, S.A. (CASA) 212 airplanes. This AD results from a report of a hub separation on a CASA 212 airplane. 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/2005/10/13/05-20170/airworthiness-directives-dowty-aerospace-propellers-type-r3214-82-f8-r3244-82-f9-r3334-82-f12-and)
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