What was found
(AUS) RH WING FLAP HAS EXTENSIVE CORROSION BETWEEN THE STEEL ATTACHMENT BRACKETS AND THE INTERNAL NOSE RIBS - ALL RIBS HAD PARTED FROM THE ATTACHMENT BRACKETS - THE TRAILING SKIN RIB SITUATED UNDER AND ON THE OUTER END OF THE STRENGTHENED WALKWAY PORTION OF THE FLAP HAD CORRODED AWAY TO VIRTUALLY NOTHING - AIRCRAFT IS OF 1963VINTAGE WITH ONLY 2100 HOURS TTIS - NO CORROSION PROTECTION WAS APPLIED DURING MANUFACTURE