What was found
AFTER RIGHT AFT LOWER NACELLE REMOVED TO FACILITATE MAINTENANCE, DISCOVERED THAT DURING A PREVIOUS LANDING GEAR REMOVAL, THE LEFT AND RIGHT OUTBOARD MLG TRUSS SUPPORTS WERE ACCIDENTLY DRILLED WHEN THE OUTBOARD TRUNNION PIN COVER WAS DRILLED OFF. THE LEFT TRUSS WAS REPAIRED BY BLENDING, BUT THE RIGHT TRUSS WAS FOUND TO BE DRILLED AS MUCH AS 0.299 INCH IN DEPTH. THE RIGHT SUPPORT WAS REPLACED WITH A NEW PART NR 730062-504. THIS DAMAGE WOULD HAVE BEEN AVOIDED BY USING A DRILL STOP OR A PROTECTIVE COVER DURING DRILLING.