What was found
(CAN) NR 1 HYDRAULIC SYS FAILED IN FLIGHT. BEYOND 30 MIN, SYSTEM DEPLETED INVESTIGATION FOUND THE NR 1 HYDRAULIC SYS CASE DRAIN LINE, PN: 82974216-003, AIPC REF: 29-00-01, FIG 5, ITEM 60, WAS FOUND CHAFED THROUGH BY A LOOP P, CLAMP, THE CUSHION MATERIAL WAS MISSING FROM THE CLAMP LT HYD SYS CASE DRAIN LINE FROM FILTER UNION TO FIREWALL AFT REMOVED FOR REPAIR AND THEN RE-INSTALLED. THE CUSHIONING MATERIAL ON THE AFFECTED LOOP CLAMPS APPEAR TO BE BLUE IN COLOR, HEAT RESISTANT TO 500 DEG F. THE CUSHIONING MATERIAL IAW PN & MIL-C-85052/2B SHOULD BE PURPLE IN COLOR, PHOSPHATE ESTER FLUID RESISTANT.