Airworthiness directives › 2023-02-03
AD 2023-02-03 Airworthiness Directives; Stemme AG Gliders
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(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.
Unsafe condition
This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as unintended slipping of the freewheel clutch with overheating (burnishing) of the friction pads inside of the clutch. The FAA is issuing this AD to ensure removal of the affected freewheel clutch from service. The unsafe condition, if not addressed, could result in a loss of thrust and consequent loss of glider control.
Affected ADs
This AD replaces AD 2022-01-09, Amendment 39-21897 (87 FR 1666, January 12, 2022).
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