EE PREPARING TO UNLOAD LOADER OFF OF LOWBOY TRAILER, CLIMBED UP ONTO LOADER TO REMOVE TEMPORARY RAINGUARD FROM EXHAUST STACK. AS HE WAS CLIMBING DOWN HE TOSSED THE COVER. WHEN HE TURNED AROUND TO STEP DOWN, HE LOST HIS FOOTING & FELL APPROXIMATELY 5' - 6' TO THE GROUND. HE IS OUT OF WORK UNTIL AT LEAST 02/06/03 WHEN HE GOES TO ORTHOPEDIST.