Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to all Stemme GmbH & Co. KG (Stemme) Models S10-V and S10-VT sailplanes that incorporate a certain propeller blade suspension fork. The proposed AD would require repetitively exchanging (through the manufacturer) the propeller blade suspension fork for a propeller blade suspension fork that has passed X-ray crack testing requirements. The proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. The actions specified by the proposed AD are intended to detect and correct fractured propeller blade suspension forks, which could result in the loss of a propeller blade during flight with possible lateral imbalance and loss of thrust.