What was found
DURING ANNUAL INSPECTION, THE FRONT SPAR CARRY-THROUGH STRUCTURE AFT WEB WAS FOUND BUCKLED IN THE LEFT LOWER WING ATTACH FITTING AREA. THE DAMAGE EXTENDED FROM THE LOWER OUTBOARD TO AND THROUGH THE UPPER INBOARD HUCK BOLTS. IT ALSO EXTENDED HORIZONTALLY BELOW FITTING FROM OUTBOARD FORWARD OF END BELOW FITTING INBOARD APPROX 18 INCHES LONG AND .1250 INCH DEEP. GREASE, DIRT AND DEBRIS HAD TO BE CLEANED FROM AREA TO ADEQUATELY INSPECT. AIRCRAFT HAS PREVIOUS HISTORY OF GEAR UP LANDING.