Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Schempp-Hirth Flugzeugbau GmbH (Schempp-Hirth) Models Ventus-2a, Ventus-2b, Discus-2a, and Discuss-2b sailplanes. This proposed AD would require you to inspect and modify the elevator mass balance. For Models Discus-2a and Discus-2b sailplanes only, this proposed AD would also require you to replace the elevator pushrod. 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 detect and correct problems within the sailplane elevator control system before they lead to flutter and sailplane instability. This could eventually result in loss of sailplane control.