Narrative:

Captain advised low cockpit oxygen. No guidance QRH. There is a limitation in the phb [pilot's hand book]. [I] discussed with maintenance and the flight crew and advised the crew regarding their fuel burn request; and reference to the phb. Crew not comfortable continuing; so the flight diverted to ZZZ. Flight was canceled at ZZZ for maintenance. Cockpit oxygen loss needs better QRH guidance for en route.

Google
 

Original NASA ASRS Text

Title: An A321 flight crew opted to divert for servicing when they discovered 'low' flight crew oxygen.

Narrative: Captain advised low cockpit oxygen. No guidance QRH. There is a limitation in the PHB [Pilot's Hand Book]. [I] discussed with Maintenance and the flight crew and advised the crew regarding their fuel burn request; and reference to the PHB. Crew not comfortable continuing; so the flight diverted to ZZZ. Flight was canceled at ZZZ for maintenance. Cockpit oxygen loss needs better QRH guidance for en route.

Data retrieved from NASA's ASRS site as of April 2012 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.