The captain said he flew what he considered to be a normal, stabilized approach, using 28 degrees of flaps and a Vref speed of 133 knots plus 5 knots. He flared the airplane over the runway and realized the sink rate was not being arrested as desired. He made a more ‘aggressive’ pull on the control yoke while advancing the thrust levers a ‘significant amount.’ The airplane landed hard, sustaining substantial damage. DFDR readout disclosed that the airspeed remained above Vref 5 knots until, at a radio altimeter altitude of 238 feet, it was 138.75 knots; thereafter, it began to drop. When the airplane touched down on the runway, airspeed was 124.75 knots, and the pitch attitude was 10.62 degrees nose up. There was a 5.54 ‘G’ vertical acceleration spike. Probable Cause: Failure of the pilot to maintain sufficient airspeed to properly flare the airplane during the landing.