Summary
The FAA proposes to adopt a new airworthiness directive (AD) for all Alexander Schleicher Model ASW 27 sailplanes equipped with integrated (wet inner surface) water ballast tanks in the wings, which could put the center of gravity (CG) of the sailplane out of the acceptable range. This proposed AD would require you to install a warning placard requiring pilots weighing more than 105 kg (231.5 lbs) to use the rearmost backrest hinge position; and require you to determine the forward empty CG and make any necessary adjustments. 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 correct the CG to the acceptable range when integrated ballast water tanks are installed. Failure of the sailplane to be within the acceptable CG range could result in loss of sailplane control.