MAIN D UNIT - EE WAS INSTALLING OUTSIDE BOLT IN #1 ENTRY AND INADVERTENTLY PUSHED THE BOOM LEVER THE WRONG WAY. SWING BOOM STRUCK CANOPY CAUSING IT TO HIT LEFT UPPER LIP & UNDER LEFT EYE AREA CAUSING FACIAL LACERATIONS. REQUIRED EXTENSIVE SUTURING. PLANS TO HAVE LEFT EYE CHECKED BY EYE DOCTOR. NO LOST TIME.