Narrative:

Departed ZZZ2 with cockpit oxygen pressure lower than normal, but crosschecked with fom and determined we had more than the minimum required pressure for dispatch at the ambient temperature. During flight at FL330, I noticed my mask oxygen pressure was zero and it did not test. I asked the first officer to check the bottle pressure and it was zero. I requested a descent from center and turned the ATC radios over to the first officer. The first officer flew and talked to ATC while I attempted to coordinate with dispatch. The ACARS on the aircraft was inoperative, but I was able to talk to dispatch on commercial radio for a short period. I decided diversion was the appropriate course of action because we still had 900 mi to go to ZZZ1 and if we experienced smoke in the cockpit, we would have no oxygen to breathe. Based on our position, the only realistic diversion base was ZZZ. ZZZ4 and ZZZ5 were too far away and off route. ZZZ6 was on the route, but was less likely to have oxygen and service than ZZZ. Although I did not specifically refer to the QRH, miscellaneous 11, I performed every action required by the procedure including coordination with dispatch. While dispatch was trying to coordinate with ZZZ and determine the availability of oxygen, we lost contact with dispatch via commercial radio. I coordinated with ZZZ center to have another air carrier X aircraft notify dispatch of our intent to divert to ZZZ. The diversion into ZZZ was uneventful. Kudos to air carrier Y ground personnel and contract maintenance for doing a great job getting the aircraft fixed. Dispatch and maintenance also did a great job. The trip from ZZZ to ZZZ1 was uneventful and the oxygen pressure seemed to hold fine. After parking at the gate, we did a close check of the oxygen pressure and determined we had used more than 300 pounds on a 2 hour flight while wearing the masks for less than 5 mins. I put an information write-up in the logbook. Supplemental information from acn 602016: upon landing and parking at the gate, crew oxygen bottle psi had dropped from approximately 1700 psi (departure) to 1400 psi (gate).

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Original NASA ASRS Text

Title: AN MD80 AT FL330 DISCOVERED CREW OXYGEN DROPPED TO ZERO. PREVIOUS HISTORY OF CREW OXYGEN PROBS. DIVERTED FOR OXYGEN SVC.

Narrative: DEPARTED ZZZ2 WITH COCKPIT OXYGEN PRESSURE LOWER THAN NORMAL, BUT XCHKED WITH FOM AND DETERMINED WE HAD MORE THAN THE MINIMUM REQUIRED PRESSURE FOR DISPATCH AT THE AMBIENT TEMP. DURING FLT AT FL330, I NOTICED MY MASK OXYGEN PRESSURE WAS ZERO AND IT DID NOT TEST. I ASKED THE FO TO CHK THE BOTTLE PRESSURE AND IT WAS ZERO. I REQUESTED A DSCNT FROM CTR AND TURNED THE ATC RADIOS OVER TO THE FO. THE FO FLEW AND TALKED TO ATC WHILE I ATTEMPTED TO COORDINATE WITH DISPATCH. THE ACARS ON THE ACFT WAS INOP, BUT I WAS ABLE TO TALK TO DISPATCH ON COMMERCIAL RADIO FOR A SHORT PERIOD. I DECIDED DIVERSION WAS THE APPROPRIATE COURSE OF ACTION BECAUSE WE STILL HAD 900 MI TO GO TO ZZZ1 AND IF WE EXPERIENCED SMOKE IN THE COCKPIT, WE WOULD HAVE NO OXYGEN TO BREATHE. BASED ON OUR POS, THE ONLY REALISTIC DIVERSION BASE WAS ZZZ. ZZZ4 AND ZZZ5 WERE TOO FAR AWAY AND OFF RTE. ZZZ6 WAS ON THE RTE, BUT WAS LESS LIKELY TO HAVE OXYGEN AND SVC THAN ZZZ. ALTHOUGH I DID NOT SPECIFICALLY REFER TO THE QRH, MISC 11, I PERFORMED EVERY ACTION REQUIRED BY THE PROC INCLUDING COORD WITH DISPATCH. WHILE DISPATCH WAS TRYING TO COORDINATE WITH ZZZ AND DETERMINE THE AVAILABILITY OF OXYGEN, WE LOST CONTACT WITH DISPATCH VIA COMMERCIAL RADIO. I COORDINATED WITH ZZZ CTR TO HAVE ANOTHER ACR X ACFT NOTIFY DISPATCH OF OUR INTENT TO DIVERT TO ZZZ. THE DIVERSION INTO ZZZ WAS UNEVENTFUL. KUDOS TO ACR Y GND PERSONNEL AND CONTRACT MAINT FOR DOING A GREAT JOB GETTING THE ACFT FIXED. DISPATCH AND MAINT ALSO DID A GREAT JOB. THE TRIP FROM ZZZ TO ZZZ1 WAS UNEVENTFUL AND THE OXYGEN PRESSURE SEEMED TO HOLD FINE. AFTER PARKING AT THE GATE, WE DID A CLOSE CHK OF THE OXYGEN PRESSURE AND DETERMINED WE HAD USED MORE THAN 300 LBS ON A 2 HR FLT WHILE WEARING THE MASKS FOR LESS THAN 5 MINS. I PUT AN INFO WRITE-UP IN THE LOGBOOK. SUPPLEMENTAL INFO FROM ACN 602016: UPON LNDG AND PARKING AT THE GATE, CREW OXYGEN BOTTLE PSI HAD DROPPED FROM APPROX 1700 PSI (DEP) TO 1400 PSI (GATE).

Data retrieved from NASA's ASRS site as of July 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.