What was found
DURING A 100-HOUR INSPECTION, THE RT MLG INBOARD TRUSS ATTACH ANGLE WAS FOUND TO HAVE A 0.9 INCH RADIUS CRACK 1.0 INCH FROM AFT END. THIS CRACK WAS STOP DRILLED AND A DOUBLER AND RADIUS BLOCK WAS INSTALLED PER DER'S REPAIR SCHEME. CRACKS APPEAR TO BE ASSOCIATED WITH AIRCRAFT HAVING MORE THAN 2,000 FLIGHT HOURS. SUBMITTER RECOMMENDS CLOSE INSPECTION OF ALL 4 ANGLES ON AIRCRAFT AT REGULAR INTERVALS.