# Airworthiness Directives; Technify Motors GmbH (Type Certificate Previously Held by Thielert Aircraft Engines GmbH) Reciprocating Engines
> **Rule** · Final rule; request for comments. · Published 2015-01-29 · Effective 2015-02-13 · 80 FR 4764
## Document
- **Document number:** 2015-00991
- **Category:** airworthiness
- **Manufacturer:** Technify Motors GmbH (Type Certificate Previously Held by Thielert
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 80 FR 4764
- **Publication date:** 2015-01-29
- **Effective date:** 2015-02-13
- **FAA docket:** Docket No. FAA-2010-0683
## Abstract

We are superseding airworthiness directive (AD) 2011-23-01 for all Technify Motors GmbH (TMG) models TAE 125-01 and TAE 125-02-99 reciprocating engines with certain part number (P/N) and serial number (S/N) clutch assemblies installed. AD 2011-23-01 required replacement of certain P/N and S/N clutch assemblies. This AD requires the same actions but expands the population of affected P/N and S/N clutch assemblies. This AD was prompted by an additional report of a clutch assembly that malfunctioned due to disk springs that received a nonconforming heat treatment process. We are issuing this AD to prevent failure of the clutch assembly, which could lead to failure of the engine, in-flight shutdown, and loss of control of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2015/01/29/2015-00991/airworthiness-directives-technify-motors-gmbh-type-certificate-previously-held-by-thielert-aircraft)
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