AD 2026-15-08: Stemme GmbH Gliders

What the FAA requires

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.

Read the full directive on the Federal Register →

Applicability

This AD applies to all Stemme GmbH Model Stemme S 12 gliders, certificated in any category. Note 1 to paragraph (c): All of the affected airplanes were produced and delivered with the affected copper sealing rings installed. (d) Subject Joint Aircraft System Component (JASC) Code 2800, Aircraft Fuel System. (e) Unsafe Condition This AD was prompted by reports of fuel leaking around certain copper sealing rings within the fuel system. The FAA is issuing this AD to prevent fuel leakage in the fuel ( printed page 47942) system. The unsafe condition, if not addressed, could result in an in-flight fire. (f) Compliance Comply with this AD within the compliance times specified, unless already done.

Part numbers this directive names (8)

Extracted from the directive text. For each: the NSN cross-reference where one exists, sellers listing it here, and open DLA solicitations on the NSN.