Narrative:

Frankfurt to atlanta, cockpit preflight ensured crew O2 bottle full (min dispatch 1000 psi). At approximately 15 west F/east noticed O2 pressure decreased to 800 psi (approximately 2 hours flight time). Crew isolated leak to be in O2 manifold going to regulators. The leak was stopped at approximately 20 west by turning O2 bottle off. All manuals available were checked, only procedure was 1000 psi for dispatch. Crew discussed options, descend to 10,000 would arrive at bos with 30,000 pounds, continue at FL310 F/east would turn O2 on in case of pressure loss (within each reach). Flight continued to atl. Problem discussed with chief pilot. Researched the problem. Crew should have descended. This type of problem should be addressed in the manuals and company policy so stating be distributed (which is in works now).

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Original NASA ASRS Text

Title: ACR FLT CREW DISCOVERED LEAK IN CREW O2 SYSTEM APPROXIMATELY 2 HOURS INTO AN 8 HOUR OVERWATER FLT.

Narrative: FRANKFURT TO ATLANTA, COCKPIT PREFLT ENSURED CREW O2 BOTTLE FULL (MIN DISPATCH 1000 PSI). AT APPROX 15 W F/E NOTICED O2 PRESSURE DECREASED TO 800 PSI (APPROX 2 HRS FLT TIME). CREW ISOLATED LEAK TO BE IN O2 MANIFOLD GOING TO REGULATORS. THE LEAK WAS STOPPED AT APPROX 20 W BY TURNING O2 BOTTLE OFF. ALL MANUALS AVAILABLE WERE CHECKED, ONLY PROC WAS 1000 PSI FOR DISPATCH. CREW DISCUSSED OPTIONS, DSND TO 10,000 WOULD ARRIVE AT BOS WITH 30,000 LBS, CONTINUE AT FL310 F/E WOULD TURN O2 ON IN CASE OF PRESSURE LOSS (WITHIN EACH REACH). FLT CONTINUED TO ATL. PROBLEM DISCUSSED WITH CHIEF PLT. RESEARCHED THE PROBLEM. CREW SHOULD HAVE DESCENDED. THIS TYPE OF PROBLEM SHOULD BE ADDRESSED IN THE MANUALS AND COMPANY POLICY SO STATING BE DISTRIBUTED (WHICH IS IN WORKS NOW).

Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.