Summary
This document proposes to adopt a new airworthiness directive (AD) that would apply to Glaser-Dirks Flugzeugbau GmbH (Glaser-Dirks) Model DG-400 gliders. The proposed AD would require replacing the upper rubber shock mounts with mounts made of stainless steel. The proposed AD would also require inspecting the rear plate of the propeller mount for cracks and proper mounting, and replacing or modifying as necessary. 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 prevent failure of the propeller suspension system caused by cracks in the propeller mounts, which could result in loss of the propeller with consequent reduced glider controllability.