Antiferroelectric Liquid Crystals (AFLC) have been extensively studied due to their physical properties offering unique electrooptical properties. Here an electrooptical effect which does not need polarizers - so called Transient Scattering Mode (TSM), observed previously for FLCs, and AFLC's was studied with using of the antiferroelectric liquid crystal with the saturated tilt angle theta = 45 degrees (Orthoconic Antiferroelectric Liquid Crystal - OAFLC). The working mixture with a short helical pitch lambda at room temperature was used to induce a Bragg scattering. The electrooptical performance of two operation regimes of an unordered surface stabilised structure is presented and discussed.