The first aircraft produced by S.P.A.D. for the military was the SPAD A.2, a tractor biplane. This two-seater had a detachable nacelle in front of the engine and propeller which was folded down, out of the way, to start the engine. In the air, an observer armed with a flexible Lewis gun occupied the nacelle and was protected from the propeller by a wire mesh screen. Visibility from pilot's cockpit behind the engine was hampered by the observer's nacelle and made landing difficult.