What was found
DURING A SCHEDULED INSPECTION FOUND PN 128580101-1, BRAKE LINE ASSY CHAFE DAMAGED BY EXCESS LENGTH CABIN FLOOR PANEL ATTACH SCREW AS DESCRIBED IN MFG SB 53-3511. REPAIR REQUIRED SPLICING IN OF NEW BRAKE LINE SEGMENT IAW SB 53-3511. HAVE FOUND THIS CONDITION ON NUMEROUS OTHER AC. RECOMMEND THAT SB 53-3511 BE CHANGED TO A MANDATORY SB DUE TO COMMON OCCURRENCE AND POSSIBILITY FOR LOSS OF BRAKING ACTION IF TUBING CHAFED THROUGH. ALSO RECOMMEND AN ALERT INFO BULLENTIN ON THIS SUBJECT.(K)