# Proposed AD FAA-2005-20856: MT-Propeller Entwicklung GmbH Propellers

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2006-05-05
- Products: MT-Propeller Entwicklung
- Product type: Propeller
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 13, 2006, 71 FR 74878
- Comments due: February 12, 2007
- Became: [AD 2006-05-05](https://openairdocs.org/ad/2006-05-05)
- Docket: FAA-2005-20856 (https://www.regulations.gov/docket/FAA-2005-20856, where comments are filed)
- Project: 2004-NE-25-AD
- FR document: E6-21184
- Official PDF: https://openairdocs.org/files/sha256/cd/e6/cde686b8339627224e1857ffcfcb82c020df3445b67dcb7d423594d710d22449 (from https://www.govinfo.gov/content/pkg/FR-2006-12-13/pdf/E6-21184.pdf)
- Federal Register: https://www.federalregister.gov/documents/2006/12/13/E6-21184/airworthiness-directives-mt-propeller-entwicklung-gmbh-propellers
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C8AAC2080A26C6D98625724300508D42.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20856

## Summary

The FAA proposes to supersede an existing airworthiness directive (AD) for certain MT-Propeller Entwicklung GmbH variable pitch and fixed pitch propellers manufactured before 1995 which had not been overhauled since April 1994. That AD currently requires overhauling the propeller blades and performing initial and repetitive visual inspections of affected propeller blades. That AD also requires removing all propeller blades from service with damaged erosion sheath bonding or loose erosion sheaths and installing any missing or damaged polyurethane protective strips. This proposed AD would require the same actions. This proposed AD results from the need to clarify the population of affected propellers previously listed in AD 2006-05-05. We are proposing this AD to prevent erosion sheath separation leading to damage of the airplane.

## Notices in this docket

- Apr 6, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6777, comments due Jun 6, 2005 (https://www.federalregister.gov/documents/2005/04/06/05-6777/airworthiness-directives-mt-propeller-entwicklung-gmbh-propellers)
- Dec 13, 2006: Notice of proposed rulemaking (NPRM)., FR document E6-21184, comments due Feb 12, 2007 (https://www.federalregister.gov/documents/2006/12/13/E6-21184/airworthiness-directives-mt-propeller-entwicklung-gmbh-propellers)

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