An ultrasonic scanning assembly for flaw detection of an airfoil having a contour, the ultrasonic scanning assembly comprising: an immersion tank; a transducer holder; and an actuator having a connection rod; the transducer holder, comprising: a floating head connected to the actuator by the connection rod; at least one sliding pin, slidably mounted to the floating head; a transducer block having at least one transducer mount and being connected to a bottom end of the at least one sliding pin and being slidably mounted to the floating head; and a plurality of feet disposed on a bottom surface of the transducer block; characterised in that: at least one sliding pin has a sliding pin cap threadedly attached to a top end of the at least one sliding pin; and the transducer holder is submerged in a liquid medium filling the immersion tank; wherein the floating head is configured to be positioned above a surface of the airfoil such that the plurality of feet are in contact with the surface, and as the transducer holder is moved across the surface by the actuator the at least one sliding pin allows the transducer block to move up and down with the contour of the airfoil without the need to raise or lower the floating head; and wherein the at least one transducer mount is oriented such that when a transducer is mounted, the transducer points towards a smooth finished surface of the transducer block, and the smooth finished surface reflects a sound wave emitted by the transducer at a known calculated angle. an immersion tank; a transducer holder; and an actuator having a connection rod; the transducer holder, comprising: a floating head connected to the actuator by the connection rod; at least one sliding pin, slidably mounted to the floating head; a transducer block having at least one transducer mount and being connected to a bottom end of the at least one sliding pin and being slidably mounted to the floating head; and a plurality of feet disposed on a bottom surface of the transducer block; characterised in that: at least one sliding pin has a sliding pin cap threadedly attached to a top end of the at least one sliding pin; and the transducer holder is submerged in a liquid medium filling the immersion tank; wherein the floating head is configured to be positioned above a surface of the airfoil such that the plurality of feet are in contact with the surface, and as the transducer holder is moved across the surface by the actuator the at least one sliding pin allows the transducer block to move up and down with the contour of the airfoil without the need to raise or lower the floating head; and wherein the at least one transducer mount is oriented such that when a transducer is mounted, the transducer points towards a smooth finished surface of the transducer block, and the smooth finished surface reflects a sound wave emitted by the transducer at a known calculated angle. a floating head connected to the actuator by the connection rod; at least one sliding pin, slidably mounted to the floating head; a transducer block having at least one transducer mount and being connected to a bottom end of the at least one sliding pin and being slidably mounted to the floating head; and a plurality of feet disposed on a bottom surface of the transducer block; characterised in that: at least one sliding pin has a sliding pin cap threadedly attached to a top end of the at least one sliding pin; and the transducer holder is submerged in a liquid medium filling the immersion tank; wherein the floating head is configured to be positioned above a surface of the airfoil such that the plurality of feet are in contact with the surface, and as the transducer holder is moved across the surface by the actuator the at least one sliding pin allows the transducer block to move up and down with the contour of the airfoil without the need to raise or lower the floating head; and wherein the at least one transducer mount is oriented such that when a transducer is mounted, the transducer points towards a smooth finished surface of the transducer block, and the smooth finished surface reflects a sound wave emitted by the transducer at a known calculated angle. at least one sliding pin has a sliding pin cap threadedly attached to a top end of the at least one sliding pin; and the transducer holder is submerged in a liquid medium filling the immersion tank; wherein the floating head is configured to be positioned above a surface of the airfoil such that the plurality of feet are in contact with the surface, and as the transducer holder is moved across the surface by the actuator the at least one sliding pin allows the transducer block to move up and down with the contour of the airfoil without the need to raise or lower the floating head; and wherein the at least one transducer mount is oriented such that when a transducer is mounted, the transducer points towards a smooth finished surface of the transducer block, and the smooth finished surface reflects a sound wave emitted by the transducer at a known calculated angle.