A transducer array which includes backing and an acoustic window separated by a plurality of elongated parallel rail members having notches in the sidewalls thereof. Notches in adjacent rail members accommodate a stave member which carries a plurality of transducer elements. A stave member may be placed in the notch and slid into position from which it may be easily removed by reversing the process. The design is such that when used with a fairing to provide hydrodynamic shape, the assembly may be free-flooded with the surrounding water medium. In situ replacement of a transducer element may be accomplished by removal of a small section of the fairing and the subsequent removal of one or more stave members.