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Proposed rule

Airworthiness Directives; Stemme GmbH Gliders

Built by the Tribune's code from the Federal Register. No AI wrote this page. Published in the Federal Register May 15, 2026. Document 2026-09801. Updated Nov. 11, 2026.

What it does

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

The Federal Aviation Administration's summary, as published in the Federal Register.

What it would change

1 part of Title 14 of the Code of Federal Regulations:

14 CFR 39

Before this

798 earlier Federal Register documents under regulation identifier 2120-AA64 since Jan. 1, 2025.

Since then:

What happens next and when

The FAA must receive comments on this NPRM by June 29, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number2026-09801
ActionNotice of proposed rulemaking (NPRM).
AgenciesTransportation Department; Federal Aviation Administration
PublishedMay 15, 2026
Comments closeJune 29, 2026
Regulation identifier (RIN)2120-AA64
DocketFAA-2026-4637

Source: the Federal Register (public domain). The document in the Federal Register