Federal Register #FAA-2026-4637

FAA Airworthiness Directives for Stemme S 12 Gliders and Safran Arriel 2E Engines

The Federal Aviation Administration (FAA) has issued airworthiness directives targeting specific safety issues in Stemme S 12 gliders and Safran Arriel 2E helicopter engines. - Government Buyer: - Federal Aviation Administration (FAA) - OEMs and Vendors: - Stemme GmbH (manufacturer of S 12 gliders and specified sealing rings) - Safran Helicopter Engines (manufacturer of Arriel 2E engines) - Products/Services Requested: - For Stemme S 12 gliders: - Replacement of defective copper sealing rings (P/N D760312016CU) with new sealing rings (P/N 831984) - Repetitive visual inspections of the fuel system for leaks - Prohibition on installation of the affected copper sealing rings - Compliance with Stemme Service Bulletin P062980082, Revision 01 - For Safran Arriel 2E engines: - Revision of maintenance programs to include new or more restrictive airworthiness limitations - Notable Requirements: - Pilots are permitted to perform the required visual inspections on Stemme S 12 gliders - The directive affects 31 Stemme S 12 gliders in the U.S. - Immediate and ongoing compliance is required, with inspections before each flight until replacement is completed, and replacement required within 100 flight hours or immediately if leakage is detected - No procurement of new products or services is solicited; this is a regulatory safety action requiring maintenance and part replacement

Description

The FAA is adopting a new airworthiness directive (AD) for all Stemme GmbH Model Stemme S 12 gliders due to reports of fuel leaking around certain copper sealing rings within the fuel system. The AD requires repetitive visual checks of the fuel system for fuel leakage and replacement of the affected copper sealing ring. It also prohibits the installation of affected parts to address the unsafe condition and prevent potential in-flight fire hazards.

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