What was found
3"" SCRATCH AFT & ABOVE FWD CARGO DOOR APPROX 18"" FROM THE TOP RT CORNER IN THE 2 O' CLOCK POSITION. DURING ROUTINE LINE MX FOUND THE FUSELAGE SKIN AT FS 541 & 3.25” BELOW STRINGER 16L TO BE DENTED. THE DENT MEASURES 4” X 0.75” X 0.040” DEEP. FOLLOWING REWORK OF THE SKIN A CRACK WAS NOTED IN THE DENT. THE SKIN IS FORMED FROM 0.150” THICK 2024 T3 CLAD ALUMINUM, CHEM MILLED TO 0.061”, IN THE BAY. MX CONTACTED ENGINEERING FOR EVALUATION & DISPOSITION. REPAIRED DAMAGED AREA IAW EA CRJ953-03835 ALL CHECKED GOOD. EA CRJ953 03835 REVISION A WAS ISSUED TO PROVIDE REPAIR INSTRUCTIONS FOR THE FUSELAGE SKIN. THE DAMAGE WAS CUT OUT RESULTING IN A 4.25” X 1.75” CUT OUT & THE SKIN REPAIRED WITH A 0.063” THICK 2024 T3 CLAD ALUMINUM EXTERNAL DOUBLER, INSTALLED USING HST11AG6 LOCK FASTENERS IN PRODUCTION LOCATIONS & HST11AG5 LOCK FASTENERS IN REPAIR LOCATIONS.