According to the final outcome of the EASA AD situation the Twin II Acro is restricted to "Loop, Turn, Lazy Eight, Chandelle, Spin" unless the rear fuselage has been reinforced in accordance with OSB 351-66/1. Without the reinforcement the SB referenced by the AD states this and also states that the part of the flight manual "Flight handbook for acrobatics" is invalid and must be rmoved from the manual. Unless you've had the reinforcement work done to the glider it's only approved for the same simple aerobatics as the regular Twin II and earlier Twin Astir. The same thing seems to go for the Twin III Acro. My club is in Canada so I referred directly to the EASA AD's when we were dealing with this but I just read the FAA AD and it says the same thing. The SB's etc can be read he

http://www.ltb-lindner.com/g-103-ad-sb.html