AN FAA INSPECTOR ON A COCKPIT ORIENTATION TOUR WITH AN FAA TRAINEE ALLEGES THAT THE INBOUND OUTBOUND CREW ON THIS THROUGH FLT DID NOT HAVE THE CREW OXYGEN SYS TURNED ON FOR THE FLT INTO ONT. CREW DISPUTES THIS IN RPTS.

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ON A THROUGH FLT IN ONT; AN FAA INSPECTOR WAS SHOWING A TRAINEE AN MD80. HE ASKED IF HE COULD STEP IN AND I SAID OK. I LEFT THE COCKPIT AND SAT IN FIRST CLASS DOING PAPERWORK. HE CAME BACK AND SAID THE REGULATOR ON THE JUMP SEAT DIDN'T WORK AND ASKED IF OXYGEN WAS ON. I WENT TO THE FLT DECK AND CHKED THE VALVE AND FOUND IT MOVED SO IT WAS SOMEWHERE BTWN OFF AND ON. I LOOKED UP AND SAW THE JUMP SEAT REGULATOR WAS OFF. AS I LOOKED UP; THE FAA INSPECTOR SAID THE FO 'OWED HIM A BEER.' WHEN HE SAID THAT I LEFT THE FLT DECK AND DID NOT DISCUSS THE MATTER FURTHER. ON PREFLT MY OXYGEN REGULATOR WAS ON AND HAD FLOW. I HAVE NO IDEA WHAT THE INSPECTOR DID TO THE JUMP SEAT REGULATOR WHEN HE TESTED IT. I ASSUMED THAT WHEN HE SAID THE FO WAS IN DEBT FOR A BEER THE MATTER WAS CLOSED AND I DECIDED NOT TO CHALLENGE HIS KNOWLEDGE OF OXYGEN REGS. SUPPLEMENTAL INFO FROM ACN 409655: WE WERE TURNING TO FLT TO PDX WITH A TOTAL GND TIME OF APPROX 30 MINS. THE FAA INSPECTOR DID NOT REQUEST TO SEE EITHER THE CAPT OR FO'S AIRMAN CERTIFICATES. THE FO DEPARTED THE FLT DECK TO DO THE EXTERIOR WALKAROUND INSPECTION AND THE CAPT RELOCATED TO THE ACFT CABIN TO REVIEW THE FLT PLAN/RELEASE PAPERWORK FOR THE NEXT SEGMENT. THE FAA INSTRUCTOR AND STUDENT THUS HAD FULL ACCESS TO THE FLT DECK FOR THEIR ORIENTATION TOUR. THEY STEPPED BACK INTO THE CABIN AND THANKED THE CAPT AND REMARKED THAT THE FO 'OWED THEM A BEER' BECAUSE THE OXYGEN WAS NOT ON AND THAT THEY WOULD 'OVERLOOK' IT THIS TIME. I ALSO OBSERVED THAT THE JUMP SEAT OXYGEN REGULATOR WAS IN THE OFF POS; JUST AS IT WAS PRIOR TO DEP OF FLT FROM SEA TO ONT. THIS IS THE NORMAL POS WHEN THERE IS NO JUMP SEAT OCCUPANT. I BELIEVE THE FAA INSPECTOR WAS UNABLE TO DEMONSTRATE OXYGEN FLOW THROUGH THE JUMP SEAT MASK BECAUSE THE REGULATOR FOR THAT SEAT WAS IN THE OFF POS.