What was found
WHILE PERFORMING RAYTHEON SB 35-3034 REPLACEMENT OF OXYGEN FITTINGS, FOUND OXYGEN LINE, PN 25SF1637-9, LOCATED AT FRAME 7 CORRODED ABOVE SLEEVE AT T-FITTING END. CAUSE OF CORROSION BELIEVED TO BE INSULATING BLANKET MADE FROM ULTRASUEDE LYING AGAINST THE LINE ON THE UNPAINTED PORTION OF SAID LINE. WHEN OXYGEN PRESSURE WAS RE-APPLIED TO SYSTEM, A SEVERE LEAK PRESENTED ITSELF AT THIS POINT. ACFT LANDINGS: 3,670.