This ultrasonic inspection effector (16) for inspecting a part, comprises of: an ultrasonic probe (24) comprising an outer surface (59) intended to be put in contact with a surface to be measured (13) on the part, and a wetting device (26) for wetting the surface to be measured (13), the wetting device (26) being jointly movable together with the ultrasonic probe (24) relative to the surface to be measured (13). The wetting device (26) comprises a liquid projection assembly (60) for projecting liquid on to the surface to be measured (13) in front of the ultrasonic probe (24) and / or on the ultrasonic probe (24).
