# Proposed AD FAA-2009-0948: Thielert Aircraft Engines GmbH (TAE) Models TAE 125-02-99 and TAE 125-01 Reciprocating Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-06-12
- Products: Thielert Aircraft Engines
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: October 18, 2011, 76 FR 64285
- Comments due: November 17, 2011
- Became: [AD 2010-06-12](https://openairdocs.org/ad/2010-06-12)
- Docket: FAA-2009-0948 (https://www.regulations.gov/docket/FAA-2009-0948, where comments are filed)
- Project: 2009-NE-30-AD
- FR document: 2011-26822
- Official PDF: https://openairdocs.org/files/sha256/79/e9/79e9924ccada5c84e4b063759c347859bd96b64ddde16b6aa2281e2e7d85defe (from https://www.govinfo.gov/content/pkg/FR-2011-10-18/pdf/2011-26822.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/10/18/2011-26822/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-models-tae-125-02-99-and-tae-125-01
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EF603564027132D98625792D00487382.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0948

## Summary

We propose to revise an existing 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 and from a comment received from the European Aviation Safety Agency (EASA) on AD 2010-06-12, (75 FR 12439, March 16, 2010). The MCAI describes the unsafe condition as:

As a consequence of occurrences and service experience, Thielert Aircraft Engines GmbH has introduced a new rail pressure control valve part number (P/N) 05-7320-E000702 and has amended the Airworthiness Limitation Section (ALS) of the Operation & Maintenance Manual OM-02-02 to include a replacement of the rail pressure control valve. Failure of this part could result in in- flight shutdowns of the engine(s).

TAE has also amended the ALS of the Operation & Maintenance Manual OM- 02-01 to include a replacement ofthe rail pressure valve. We are proposing this AD to prevent engine in-flight shutdown, possibly resulting in reduced control of the aircraft.

## Notices in this docket

- Oct 19, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-25035, comments due Nov 18, 2009 (https://www.federalregister.gov/documents/2009/10/19/E9-25035/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-models-tae-125-02-99-and-tae-125-01)
- Oct 18, 2011: Notice of proposed rulemaking (NPRM)., FR document 2011-26822, comments due Nov 17, 2011 (https://www.federalregister.gov/documents/2011/10/18/2011-26822/airworthiness-directives-thielert-aircraft-engines-gmbh-tae-models-tae-125-02-99-and-tae-125-01)

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