B737-700
Flight Crew Last 90 Days 246
Human-Machine Interface
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors; Procedure
I received a call from my Chief Pilot concerning the aircraft I ferried the previous night. The originating crew following our ferry flight reported that the crew oxygen system was turned off.   I am well versed and knowledgeable with the B737 and all our operating procedures; including the crew oxygen system preflight. I thought I had completed all the required checks. However; in light of the other crew's report; it may be possible that we missed completing the preflight of the oxygen system; and also may be possible that we missed the crosscheck during the Before Start Checklist. The ferry flight in question was the second aircraft and flight within 30 minutes. It is possible that I was distracted during my preflight duties due to factors such as: unfamiliar uncontrolled airport; late at night; aircraft was a 'thru-flight' powered up upon our arrival; extra paperwork/calls to Dispatch; and the Captain's offer to complete the walkaround.   Although I did not feel pressured or distracted at the time of the preflight/checklist; the operation was far from a 'normal' sequence of events typically found during revenue operations.
Preflighted aircraft normally and flew [a short ferry flight]. Next crew discovered O2 valve shut off.  While I remember doing that check; I must have done it incorrectly as I did not see a drop in the gauge. We were moving quickly through the checklist but did not rush.
B737 flight crew is informed after a ferry flight that the crew oxygen bottle was turned off for the flight.