This emergency AD was prompted by a Cessna Model LC41-550FG that suffered a significant structural failure in the wing during a production acceptance flight test. The wing skin disbonded from the upper forward wing spar. The length of the disbond was approximately 7 feet. This condition, if not corrected, could result in catastrophic failure of the wing due to disbonding of the wing skin from the wing spar. We are evaluating this situation and may take additional AD action as necessary.