EASA Regulations for Stemme Ag S12

5 airworthiness directives and regulations affecting Stemme Ag S12.

EASA AD 2025-0155

Fuel — Fuel Pump Set and Drainer Assembly / Copper Sealing — Replacement

EASA Airworthiness Directive 2025-0155 is issued for Stemme S12 powered sailplanes, addressing a fuel leak issue related to the fuel pump set and drainer assembly copper sealing rings. The directive mandates replacement of the affected copper sealing rings with improved FKM (Viton®) sealing rings to ensure continued airworthiness and safety of these aircraft.

Jul 21, 2025

Airworthiness DirectiveMaintenanceSafety MgmtStemme Ag S12

EASA AD 2021-0278R1

Powerplant — 12AK Clutch — Prohibition of Flights

EASA Airworthiness Directive 2021-0278R1 is a regulatory update addressing safety concerns for Stemme S10-VT and Stemme S12 powered sailplanes equipped with the freewheel clutch Part Number 12AK. The directive prohibits flight operations of powered sailplanes with affected clutches due to risks of clutch slipping and overheating, which could lead to total loss of thrust and potential loss of control. It applies to all serial numbers of these aircraft models and mandates compliance with Stemme AG Service Bulletin P062-980058 revisions.

Aug 11, 2022

Airworthiness DirectiveFlight OpsMaintenanceSafety MgmtStemme Ag S10Stemme Ag S12Stemme S10-VTStemme S12

EASA AD 2022-0101-E

Wings — Outer Wing Connection — Inspection

EASA Airworthiness Directive 2022-0101-E is an emergency directive addressing a structural issue in Stemme AG S12 powered sailplanes, specifically affecting outer wing connections with part numbers 012403 (right-hand side) and 012402 (left-hand side). The directive mandates inspection of these outer wing connections due to a production deviation causing incorrect positioning of glass-fibre reinforced plastic blocks in the outer wing spar. This AD applies to Stemme S12 sailplanes with serial numbers 12-002 to 12-042 inclusive and 12-044.

Jun 2, 2022

Airworthiness DirectiveMaintenanceSafety MgmtStemme Ag S12

EASA AD 2019-0130-E

Main Landing Gear — Upper Connection — Inspection / Repair

EASA Airworthiness Directive 2019-0130-E is an emergency directive addressing the main landing gear upper connection inspection and repair for Stemme AG S12 powered sailplanes, specifically serial numbers 12-002 to 12-026 inclusive. It mandates a one-time inspection of the main landing gear installation to detect incorrect axle installation that could lead to damage or injury. The directive provides instructions for inspection and corrective actions based on findings.

Jun 7, 2019

Airworthiness DirectiveMaintenanceSafety MgmtStemme Ag S12

EASA AD 2019-0082

Navigation — Airspeed Indicator — Inspection / Replacement

EASA Airworthiness Directive 2019-0082 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Stemme AG S 12 powered sailplanes with serial numbers 12-002 to 12-021. It addresses an issue with airspeed indicators (ASI) having Stemme Part Numbers IF-W230 or IF-W190, which may have incorrect speed markings. The directive mandates inspection, possible AFM amendment, and replacement of affected ASIs to ensure flight safety.

Apr 12, 2019

Airworthiness DirectiveMaintenanceSafety MgmtStemme Ag S12Stemme AG S 12