What was found
(AUS) LOW PRESSURE OXYGEN DISTRIBUTION PIPES FOR PILOT AND CO-PILOT OXYGEN SUPPLY EXTENSIVELY CHAFED FROM CONTACT WITH THE LH AND RHFLIGHT COMPARTMENT SHELVES. CHAFING DAMAGE IN SOME AREAS WAS0.508MM TO 0.584MM (0.020IN TO 0.023IN) DEEP. DAMAGE LIMITIS 0.254MM (0.010IN). PIPES HAD PROTECTIVE TEFLON SPIRAL WRAP INSTALLED WHICH WAS IN GOOD CONDITION SUGGESTING THAT THE CHAFING HAD OCCURRED PRIOR TO FITMENT OF THE SPIRAL WRAP. FOUND DURING INSPECTION IAW TSI-DHC8-35-003.