# Airworthiness Directives; Thielert Aircraft Engines GmbH Reciprocating Engines
> **Rule** · Final rule. · Published 2013-11-25 · Effective 2013-12-30 · 78 FR 70216
## Document
- **Document number:** 2013-28183
- **Category:** airworthiness
- **Manufacturer:** Thielert
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 78 FR 70216
- **Publication date:** 2013-11-25
- **Effective date:** 2013-12-30
- **FAA docket:** Docket No. FAA-2013-0561
## Abstract

We are adopting a new airworthiness directive (AD) for all Thielert Aircraft Engines GmbH TAE 125-01 reciprocating engines. This AD requires applying sealant to close the engine clutch housing (crankcase assembly) opening. This AD was prompted by a report of engine power loss due to engine coolant contaminating the engine clutch. The design of the engine allows the crankcase assembly opening to be susceptible to contamination from external sources. We are issuing this AD to prevent in-flight engine power loss, which could result in loss of control of, and damage to, the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2013/11/25/2013-28183/airworthiness-directives-thielert-aircraft-engines-gmbh-reciprocating-engines)
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