Summary
The FAA proposes to adopt a new airworthiness directive (AD) for certain DG Flugzeugbau GmbH, Model DG-500MB sailplanes. This proposed AD would require you to replace the engine pylon extension/retraction Warner LA10 spindle drive with an improved designed Stross BSA 10 spindle drive and to modify the electrical system following applicable service information. This proposed AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Germany. We are issuing this proposed AD to prevent failure of the Warner LA10 spindle drive, which could result in the engine pylon not rising or lowering. This condition could cause an unstable engine pylon assembly during flight with loss of control of the sailplane.