What was found
LAV SERVICE PAN SHOWS EVIDENCE OF CORROSIONREMOVED LAV ACCESS PANELS 141QW, 141PW, AND AND 141MW FOR LAV REPAIR. REMOVED LAV SERVICE DOOR AND HINGES, BAGGED AND TAGGED HARDWARE. CLEANED FUSELAGE SKIN IN PREP FOR MARKING STRINGER AND FRAME LOCATIONS. REMOVED INSULATION BLANKETS AROUND LAV SERVICE DRAIN. NOTED MAJOR REPAIR. INITIATED SFR REMOVED INNER AND OUTTER LAV PAN AND SUPPORT STRUCTURE REF SRM 51-40-02. FOUND SKIN SEVEARLY CORRODED. REMOVED PRELIMINARY LAYER OF CORROSION FROM FUSELAGE SKIN. WILL NEED FURTHER CORROSION REMOVAL, 1/4 INCH GRID DRAWN AND MEASURED FOR ENGENEERING. ALSO SENT AND EMAIL TO ESC TX SO THEY CAN START AN AVO. NEED DIMENSIONS AND STATION/STRINGER LOCATIONS FOR EXISTING REPAIR JUST ABOVE LAV PAN OPENING SUBMITTED TO ENGINEERING AS WELL. INITIATED SDR. ACCOMPLISHED STEP 1,2 AND 3 PER AVO16543 COROSSION DAMAGE REMOVAL PER SRM 51-10-02 READY FOR HOLE INPECTIONS ,HFEC AND ULTRASONIC REMAINING THICKNESS MEASUREMENTS PER AVO 16543 PERFORMED HFEC INSP OF BLENDED AREAS IAW NDTM PART 6 51-00-00 PROCEDURE 23 PER AVO16543 REV. ORIG STEP 5. NO CRACKS DETECTED. HOLE PROB HFEC AND REMAINING THICKNESS MEASUREMENTS STILL REQUIRED. OVERSIZED 5 HOLES TO .199 COMMON TO FUSELAGE SKIN AND LAV PAN NUMBERED 1-5 TO REMOVE DAMAGE IN EXTERIOR SKIN. REF SRM 51-40-02 AND AVO 16543. OVERSIZED 5 HOLES TO .199 COMMON TO FUSELAGE SKIN AND LAV PAN NUMBERED 1-5 TO REMOVE DAMAGE IN EXTERIOR SKIN. REF SRM 51-40-02 AND AVO 16VERIFIED RII REQUIREMENT BEEN COMPLIED WITH PER ECRA 5330-07690.