a method and apparatus for extending the effective circumferential extent of an original an aircraft simulator mirror cell having a base support structure mounted to a movable platform , the base support structure being in generally the shape of a portion of a sphere of a predetermined radius and having a predetermined circumferential extent defined by original edges of the support structure configured to support a vacuum - shaped reflective film . the improvement includes a pair of extension wing structures having substantially the same spherical radius as the base support structure and a substantial circumferential extent , each of the pair of wing structures being attached to one of the original edges of the base support structure and substantially sealed thereto , the extension wing structures , when attached , extending the effective circumferential extent of the base support structure by a substantial amount , each of the pair of extension wing structures having outer edges for supporting a vacuum - shaped reflective film .