# Proposed AD FAA-2009-0776: Dowty Propellers Constant Speed Propellers

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-17-11
- Products: Dowty Propellers
- Product type: Propeller
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 19, 2014, 79 FR 15269
- Comments due: May 19, 2014
- Became: [AD 2010-17-11](https://openairdocs.org/ad/2010-17-11)
- Docket: FAA-2009-0776 (https://www.regulations.gov/docket/FAA-2009-0776, where comments are filed)
- Project: 2009-NE-32-AD
- FR document: 2014-06010
- Official PDF: https://openairdocs.org/files/sha256/19/8a/198a2b7f5f3377d038c717f929b43530ba1ff83e6fe7b7230d919842ed3dc3d3 (from https://www.govinfo.gov/content/pkg/FR-2014-03-19/pdf/2014-06010.pdf)
- Federal Register: https://www.federalregister.gov/documents/2014/03/19/2014-06010/airworthiness-directives-dowty-propellers-constant-speed-propellers
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B7DA1595DB8B6A9C86257CA00044D43E.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0776

## Summary

We propose to revise airworthiness directive (AD) 2010-17- 11R1, which applies to all Dowty Propellers R408/6-123-F/17 model propellers. AD 2010-17-11R1 requires initial and repetitive application of sealant between the bus bar assembly and the backplate assembly of certain line-replaceable units (LRUs). That AD also provides an optional terminating action to the repetitive re-application of sealant. This proposed AD would increase the interval allowed between the required re-application of sealant, and would specify an additional acceptable sealant. We are proposing this AD to prevent an in-flight double generator failure, which could result in reduced control of the airplane.

## Notices in this docket

- Sep 25, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-23209, comments due Oct 26, 2009 (https://www.federalregister.gov/documents/2009/09/25/E9-23209/airworthiness-directives-dowty-propellers-r4086-123-f17-model-propellers)
- Feb 7, 2013: Notice of proposed rulemaking (NPRM)., FR document 2013-02730, comments due Apr 8, 2013 (https://www.federalregister.gov/documents/2013/02/07/2013-02730/airworthiness-directives-dowty-propellers-propellers)
- Mar 19, 2014: Notice of proposed rulemaking (NPRM)., FR document 2014-06010, comments due May 19, 2014 (https://www.federalregister.gov/documents/2014/03/19/2014-06010/airworthiness-directives-dowty-propellers-constant-speed-propellers)

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