# Proposed AD FAA-2008-0750: Dowty Propellers R175/4-30; R184/4-30- 4; R193/4-30-4; R.209/4-40-4.5; R212/4-30-4; R.245/4-40-4.5; R251/4-30- 4; R257/4-30-4; and R.259/4-40-4.5 Model Propellers

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-10-23
- Products: Dowty Aerospace Propellers
- Product type: Propeller
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 29, 2008, 73 FR 50892
- Comments due: October 28, 2008
- Became: [AD 2010-10-23](https://openairdocs.org/ad/2010-10-23)
- Docket: FAA-2008-0750 (https://www.regulations.gov/docket/FAA-2008-0750, where comments are filed)
- Project: 2008-NE-21-AD
- FR document: E8-20081
- Official PDF: https://openairdocs.org/files/sha256/da/55/da55c6e3d8931ba9c3aa39460bd0862349323f4dd48686c68f80340f346788af (from https://www.govinfo.gov/content/pkg/FR-2008-08-29/pdf/E8-20081.pdf)
- Federal Register: https://www.federalregister.gov/documents/2008/08/29/E8-20081/airworthiness-directives-dowty-propellers-r1754-30-r1844-30-4-r1934-30-4-r2094-40-45-r2124-30-4
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/CCAAA397C413078B862574B400493D93.0001
- Page: https://openairdocs.org/proposed/FAA-2008-0750

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for all Dowty Rotol propellers. That AD currently requires, for all Dowty Rotol propellers, visual inspections for seizure and for cadmium plating of the blade pitch change operating links and eyebolt fork assemblies. That AD also requires replacement or heat-treatment of the blade pitch change operating links and eyebolt fork assemblies, if necessary. This proposed AD would require the same actions, but only for certain model Dowty Propellers. This proposed AD results from the FAA determining that AD 70-16-02 does not apply to all propellers, since current Dowty Rotol propellers are differently designed. We are proposing this AD supersedure to specify the affected propeller models, and to prevent seizure or embrittlement and cracking of the blade pitch change operating links and eyebolt fork assemblies, which could result in reduced controllability of the airplane.

## Notices in this docket

- Aug 29, 2008: Notice of proposed rulemaking (NPRM). (first notice), FR document E8-20081, comments due Oct 28, 2008 (https://www.federalregister.gov/documents/2008/08/29/E8-20081/airworthiness-directives-dowty-propellers-r1754-30-r1844-30-4-r1934-30-4-r2094-40-45-r2124-30-4)

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