# Airworthiness Directives; Stemme GmbH Gliders
> **Rule** · Final rule. · Published 2026-07-30 · Effective 2026-09-03 · 91 FR 47940
## Document
- **Document number:** 2026-15466
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 91 FR 47940
- **Publication date:** 2026-07-30
- **Effective date:** 2026-09-03
- **FAA docket:** Docket No. FAA-2026-4637
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Stemme GmbH (Stemme) Model Stemme S 12 gliders. This AD was prompted by reports of fuel leaking around certain copper sealing rings within the fuel system. This AD requires repetitive visual checks of the fuel system for fuel leakage, and replacement of the affected copper sealing ring. This AD also prohibits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/07/30/2026-15466/airworthiness-directives-stemme-gmbh-gliders)
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