# Proposed AD FAA-2009-0201: Thielert Aircraft Engines GmbH (TAE) Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-11-09
- Products: Thielert Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: November 22, 2011, 76 FR 72128
- Comments due: January 23, 2012
- Became: [AD 2010-11-09](https://openairdocs.org/ad/2010-11-09)
- Docket: FAA-2009-0201 (https://www.regulations.gov/docket/FAA-2009-0201, where comments are filed)
- Project: 2008-NE-47-AD
- FR document: 2011-30059
- Official PDF: https://openairdocs.org/files/sha256/a5/dc/a5dca2f86dc867396f26f07ab202f2357246824d314860a53564c6b9fbbcb232 (from https://www.govinfo.gov/content/pkg/FR-2011-11-22/pdf/2011-30059.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/11/22/2011-30059/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-reciprocating-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/88D5056E34CD71D186257950004DAD97.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0201

## Summary

We propose to revise an existing airworthiness directive (AD) that applies to TAE models TAE 125-01 and TAE 125-02-99 reciprocating engines installed on, but not limited to, Diamond Aircraft Industries Model DA 42 airplanes. The existing AD currently requires initial and repetitive replacements of proportional pressure reducing valves (PPRVs) (also known as propeller control valves). Since we issued that AD, TAE has increased the life of the PPRV, part number (P/N) 05-7212- E002801, on TAE 125-02-99 engines, from 300 hours to 600 hours. This proposed AD would relax the repetitive replacement interval from a 300- hour interval to a 600-hour interval for PPRVs, P/N 05-7212-E002801, on TAE 125-02-99 engines. We are proposing this AD to prevent engine in- flight shutdown, possibly resulting in reduced control of the aircraft.

## Notices in this docket

- Apr 17, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-8785, comments due May 18, 2009 (https://www.federalregister.gov/documents/2009/04/17/E9-8785/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-models-tae-125-01-and-tae-125-02-99)
- Feb 23, 2010: Supplemental Notice of proposed rulemaking (NPRM); reopening of comment period., FR document 2010-3484, comments due Mar 25, 2010 (https://www.federalregister.gov/documents/2010/02/23/2010-3484/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-models-tae-125-01-and-tae-125-02-99)
- Nov 22, 2011: Notice of proposed rulemaking (NPRM)., FR document 2011-30059, comments due Jan 23, 2012 (https://www.federalregister.gov/documents/2011/11/22/2011-30059/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-reciprocating-engines)

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