What was found
(CAN) DURING ULTRASONIC INSPECTION FOR DISBONDING OF FUSELAGE SKIN IAW DHC 8 SIP TASK 5300/1, A SIGNIFICANT AREA OF DISBONDING FOUND IN RT FUSEALAGE SKIN BETWEEN STATIONS X531.50 AND X550.50, AND BETWEEN STRINGERS 26S AND 28S. BOMBARDIER WAS CONTACTED FOR REPAIR AND DRAWING RD8-53-4760 WAS ISSUED. DAMAGE CUT AWAY, CHECKING FOR CRACKS AND ADDITIONAL DISBOND, AND FABRICATION/INST OF AN EXTERNAL DOUBLER WAFFLE DOUBLER SEPARATED FROM SKIN SHOWING ALL BONDING MATERIAL ADHERED TO DOUBLER, WITH NO ADHESIVE ON SKIN SECTION. HEAVY CORROSION FOUND ON SKIN SECTION CONTACT SURFACE. PARTS SENT TO BOMBARDIER.