A Piedmont Airlines Boeing 737-200 aircraft experienced a ground impact accident at Greensboro-High Point Airport, North Carolina. The aircraft ran off the end of runway 14 after landing, resulting in four injuries, including three passengers and one flight attendant. The aircraft’s ILS approach was initiated at a faster-than-normal airspeed, exceeding the designated approach end of the runway. Dynamic hydroplaning caused by heavy rain conditions led to the collapse of the landing gears. Contributing factors included an unstabilized downwind approach, a long, fast touchdown on a downslope runway, and delayed deployment of the automatic spoilers. The failure of the crew to deploy the spoilers manually is considered a contributing factor.A Piedmont Airlines Boeing 737-200 aircraft experienced a ground impact accident at Greensboro-High Point Airport, North Carolina. The aircraft ran off the end of runway 14 after landing, resulting in four injuries, including three passengers and one flight attendant. The aircraft’s ILS approach was initiated at a faster-than-normal airspeed, exceeding the designated approach end of the runway. Dynamic hydroplaning caused by heavy rain conditions led to the collapse of the landing gears. Contributing factors included an unstabilized downwind approach, a long, fast touchdown on a downslope runway, and delayed deployment of the automatic spoilers. The failure of the crew to deploy the spoilers manually is considered a contributing factor.