# Proposed AD FAA-2010-0308: Thielert Aircraft Engines GmbH (TAE) Model TAE 125-01 Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-14-21
- Products: Thielert Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 5, 2010, 75 FR 17084
- Comments due: May 20, 2010
- Became: [AD 2010-14-21](https://openairdocs.org/ad/2010-14-21)
- Docket: FAA-2010-0308 (https://www.regulations.gov/docket/FAA-2010-0308, where comments are filed)
- Project: 2010-NE-17-AD
- FR document: 2010-7590
- Official PDF: https://openairdocs.org/files/sha256/0f/07/0f0702d2a5b97bc27c296c7071cfc23e7a1949c2c3e2b21c7ca6e387c0d4d9f4 (from https://www.govinfo.gov/content/pkg/FR-2010-04-05/pdf/2010-7590.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/04/05/2010-7590/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-model-tae-125-01-reciprocating-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EE0BEC8B076FACED862576FC0049FDC7.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0308

## 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 has shown that the small outlet of the blow-by oil separators, part number 02-7250-18100R1; 02-7250-18100R2; 02-7250- 18100R3; 02-7250-18100R4; 02-7250-18300R1; 02-7250-18300R2; 02-7250- 18300R3; 02-7250-18300R4; or 02-7250-18300R5, may cause a blow-by gas pressure increase inside the crankcase of the engine in excess of the oil seal design pressure limits. Leaking engine oil may adversely affect the gearbox clutch or the engine lubrication system. This condition, if not corrected, could lead to in-flight cases of engine power loss or ultimately, shutdown. We are proposing this AD to prevent loss of engine power or uncommanded engine shutdownduring flight due to excessive crankcase blow-by gas pressure.

## Notices in this docket

- Apr 5, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-7590, comments due May 20, 2010 (https://www.federalregister.gov/documents/2010/04/05/2010-7590/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-model-tae-125-01-reciprocating-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.