Airworthiness Directive · Amendment 39-22310 · Powerplant system
Stemme AG Gliders
This AD applies to Stemme AG Model Stemme S 10-VT and Model Stemme S 12 gliders, all serial numbers, certificated in any category, with a freewheel clutch having part number 12AK with a serial number starting with “12-” installed, except those which have been modified by following the instructions of Stemme Service Bulletin Doc. No. P062-980058, Revision 02, dated April 19, 2022, and have been re-identified with “/M” at the end of the serial number.
The FAA is superseding Airworthiness Directive (AD) 2022-01-09 for certain Stemme AG Model Stemme S 10-VT and Model Stemme S 12 gliders. AD 2022-01-09 required removing the affected freewheel clutch from service and prohibited the installation of affected parts. Since the FAA issued AD 2022-01-09, the European Union Aviation Safety Agency (EASA) superseded its mandatory continuing airworthiness information (MCAI) to amend the definition of an affected part. This AD retains the requirements of AD 2022-01-09 for removing the affected freewheel clutch from service and continues to prohibit the installation of an affected part, and amends the definition of an affected part and clarifies the part installation prohibition. The FAA is issuing this AD to address the unsafe condition on these products.
(1) Before further flight after the effective date of this AD, remove the freewheel clutch from service.
(2) As of the effective date of this AD, do not install a freewheel clutch part number 12AK with a serial number starting with “12-” on any glider, unless it has been modified by following the instructions of Stemme Service Bulletin Doc. No. P062-980058, Revision 02, dated April 19, 2022, and has been re-identified with “/M” at the end of the serial number.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
