THE EE WAS STANDING ON THE TOP STEP OF A PORTABLE STAIRWAY (APPROX 38"" ABOVE FLOOR LEVEL)THE EE WAS USING AN AIRLANCE TO CLEAN A CHOCKED HOPPER WHEN THE EE TURNED THE AIRLANCE ON HE LOST HIS BALANCE & FELL BACKWARDS DOWN TO THE FLOOR LEVELEE STRUCK HIS HEAD ON A STAIR CAUSING MOMENTARY LOSS OF CONSCIOUSNESS & A CONCUSSION EE BEGAN LOSING TIME 3/19/03