What was found
LOSS OF NR 1 HYD SYS, AFTER LANDING WITH ENGINES STILL RUNNING, NR 1 HYD LOW PRESSURE EICAS MESSAGE WITH ASSOCIATED MASTER CAUTION. ALSO, VISIBLE LIQUID IN AFT EQUIPMENT BAY. FOUND AN ADEL CLAMP CUSHION BECAME WORN TO THE POINT THAT THE METAL STRAP PORTION OF THE CLAMP CHAFED THROUGH THE HYD LINE. RESULTING IN LOSS OF THE ACFT NR 1 HYD SYS WITH COMPLETE LOSS OF SYSTEM FLUID. THERE WERE ADDITIONAL AREAS OF CHAFE DAMAGE TO THE HYD LINE CAUSED BY OTHER WORN ADEL CLAMPS.