# Proposed AD FAA-2010-0892: Thielert Aircraft Engines GmbH Models TAE 125-02-99 and TAE 125-02-114 Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-24-05
- Products: Thielert Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 28, 2010, 75 FR 66342
- Comments due: December 13, 2010
- Became: [AD 2010-24-05](https://openairdocs.org/ad/2010-24-05)
- Docket: FAA-2010-0892 (https://www.regulations.gov/docket/FAA-2010-0892, where comments are filed)
- Project: 2010-NE-32-AD
- FR document: 2010-27228
- Official PDF: https://openairdocs.org/files/sha256/81/db/81db5032d3920c6d2c7adbff56574e051ab48e6c854d8a2aff97322f7217a392 (from https://www.govinfo.gov/content/pkg/FR-2010-10-28/pdf/2010-27228.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/10/28/2010-27228/airworthiness-directives-thielert-aircraft-engines-gmbh-models-tae-125-02-99-and-tae-125-02-114
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/1F19874F8147A088862577CA00457642.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0892

## 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:

Service experience has shown that fracture of the timing chain has occurred due to chain wear. This condition, if not corrected, could lead to in-flight cases of engine shutdown.

We are proposing this AD to prevent engine in-flight shutdown leading to loss of control of the airplane by requiring life limits for the timing chain.

## Notices in this docket

- Oct 28, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-27228, comments due Dec 13, 2010 (https://www.federalregister.gov/documents/2010/10/28/2010-27228/airworthiness-directives-thielert-aircraft-engines-gmbh-models-tae-125-02-99-and-tae-125-02-114)

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