NYC83FA244

The helicopter was on a flt to transport an acutely ill patient from one hospital to another. The aircrew consisted of a plt & two flt nurses. During arrival at the destination, the plt began an apch to an athletic field that was surrounded by tall bldgs & a power line. The plt said the apch was made on a southeasterly heading with the wind from 230 deg at 7 KTS. At about 45 ft AGL with an airspeed of aprx 25 KTS, translational lift was lost & the helicopter yawed left. The application of full right anti-torque pedal failed to stop the yaw. The helicopter touched down in a left yaw & the plt applied collective. It became airborne again, still in a left yaw, then the nose gear struck the ground & the rotor blades struck a brick wall of a building on the south side of the field. An exam of the wreckage revealed no preimpact descrepancies. The flt nurses reported that the apch seemed higher & faster than normal. Aprx 7 mi nnw at pittsburg, PA, the wind was from 260 deg at 10 KTS. The plt had aprx 30 hrs with clockwise/french rotor sys.