This report contains the results of a six month study designed to establish the applicability of the TRW Acousto-Optical System in depicting internal defects and surface flaws existing in an 81mm projectile body. An 81mm projectile body was furnished to TRW Systems which contained three known flaws. The known flaws consisted of two surface flaws on the outer surface of the shell and one crack in the inner wall. Acousto-optical images of these three flaws were obtained in the frequency range from 8 to 20 megacycles.