What was found
PILOT O2 MASK HAD ORIGINAL O/H DATE OF 6/05. MASK WAS PLACED IN SERVICE IN AC 55093. MASK DID NOT TEST PROPERLY AT DELIVERY DATE OF 6/23/05. MASK WAS SENT BACK, FOUND TO HAVE A LEAK. MASK WAS REPAIRED AND SENT BACK TO AC. MASK WAS FOUND TO BE LEAKING AGAIN AFTER 2 WEEKS IN AIRCRAFT. AGAIN, IT WAS REPAIRED. PLACED BACK IN SERVICE, AFTER 2 MONTHS MASK WAS FOUND LEAKING AGAIN. IT WAS SENT BACK FOR ANOTHER REPAIR, DATED 12/5/05. MASK HAS BEEN FOUND TO BE LEAKING FOR FOURTH TIME, SENT BACK FOR FOURTH TIME FOR REPAIR. 4 REPAIRS ON THIS MASK SINCE O/H DATE OF 6/05 IS UNACCEPTABLE. HAVE SERIOUS DOUBTS AS TO CAPABILITIES TO MAKE OVERHAULS AND REPAIRS THAT LAST. PILOT O2 MASK IS VERY CRITICAL COMPONENT.