EMPLOYEE USING A SELF PROPELLED WORK PLATFORM AND WORKING ABOUT 10' OFF THE GROUND AND BESIDE KILN #2, REMOVING ELECTRICAL CABLE TRAY. THE KILN HAS BEEN MODIFIED BY ADDING A DOOR ON THE SIDE T O FACILITATE BURNING TIRES. THE DOOR ON THE SIDEOF THE ROTATING KILN FAILED TO SEAL COMPLETELY WHEN CLOSED AND ALLOWED HOT DUST TO FALL ON EMPLOYEE AND HE GOT DUST IN EYES.