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 July 30, 2026. Document 2026-15466. Updated Nov. 7, 2026.

What it does

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.

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

What changed in the regulation

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

14 CFR 39

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Federal Aviation Administration has published 482 final rules in 2026 so far, compared with 518 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

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

Since then:

What happens next and when

This AD is effective September 3, 2026.

The agency's dates, word for word.

Check it yourself

The record as published

Document number	2026-15466
Action	Final rule.
Agencies	Transportation Department; Federal Aviation Administration
Published	July 30, 2026
Effective date	Sept. 3, 2026
Regulation identifier (RIN)	2120-AA64
Docket	FAA-2026-4637

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