What was found
DURING A SCHEDULED INSPECTION ASB21-01, DAMAGE WAS DISCOVERED AT FRAME 5 AT APPROXIMATELY FS 4,709MM RELATING TO THE STC SR00566DE, DRAWING 739-1600, WALL. THE DAMAGE IS ADJACENT TO THE MEDICAL WALL ATTACH FITTING LOCATIONS. PERFORMED THE ALERT SERVICE BULLETIN ASB21-01, REVISION A. ADDITIONAL DAMAGE WAS ALSO NOTED ON THE LT AND RT CABIN FRAME 5 ASSEMBLY AND REINFORCEMENT ANGLE AT APPROXIMATELY FUSELAGE STATION 4,709MM, WATER LINE 2,600MM. THIS DAMAGE IS RELATED TO STC SR09164 – DRAWING 135M-420, EMS SEAT & STRUCTURE INST-EC-135. THIS INSTALLATION WAS REMOVED AND REPLACED WITH THE AMC EMS INTERIOR PREVIOUSLY MENTIONED ABOVE. THERE IS ONE CRACK ON THE LT STRUCTURE WHERE THE BEAM ASSY ATTACHED TO THE FRAME 5 MEASURING APPROXIMATELY 0.50 IN LENGTH AND ONE CRACK IN THE RT STRUCTURE WHERE THE BEAM ASSY ATTACHED TO THE FRAME 5 MEASURING APPROXIMATELY 0.70 IN LENGTH. THESE CRACKS WERE STOP DRILLED, THEN REINFORCED VIA REPAIR DOUBLERS IAW RDAS AHI 135 53 048 19, REVISION B.