# Proposed AD FAA-2009-0753: Thielert Aircraft Engines GmbH (TAE) Model TAE 125-01 Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2009-24-10
- Products: Thielert Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 17, 2009, 74 FR 47760
- Comments due: October 19, 2009
- Became: [AD 2009-24-10](https://openairdocs.org/ad/2009-24-10)
- Docket: FAA-2009-0753 (https://www.regulations.gov/docket/FAA-2009-0753, where comments are filed)
- Project: 2009-NE-31-AD
- FR document: E9-22314
- Official PDF: https://openairdocs.org/files/sha256/2c/61/2c6140264395f88cbec6bfa30e753e8c8efde36b3a758e09819f4fef67b6f1dd (from https://www.govinfo.gov/content/pkg/FR-2009-09-17/pdf/E9-22314.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/09/17/E9-22314/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-model-tae-125-01-reciprocating-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5A5233079ECD6DE88625763400496AB5.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0753

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

In-flight engine shutdown incidents were reported on aircraft equipped with TAE-125-01 engines. This was found to be mainly the result of operation over a long time period with broken piston cooling oil nozzles which caused thermal overload of the piston.

We are proposing this AD to prevent engine in-flight shutdown, possibly resulting in reduced control of the aircraft.

## Notices in this docket

- Sep 17, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-22314, comments due Oct 19, 2009 (https://www.federalregister.gov/documents/2009/09/17/E9-22314/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-model-tae-125-01-reciprocating-engines)

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