airworthiness · Rule · Final rule. · Published 2026-07-30 · Effective 2026-09-03 · 91 FR 47940
Document
Document number
2026-15466
Federal Register citation
91 FR 47940
Type
Rule
Action
Final rule.
Category
airworthiness
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.