A captain and first officer report about the loss of their crew O2 bottle pressure that read 'zero' ...

Attributes
ACN	1158928
Time
Date	201403
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 6
Person 2
Function	First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Other / Unknown

Narrative:

Maintenance had replaced crew O2 bottle and first officer mask regulator in ZZZ. [We were] approaching an intersection; arranged for a bathroom break. First officer found his oxygen inoperative and the crew bottle at zero. Coordinated for a descent and ran QRH. Procedure is under miscellaneous and is not in index [of QRH]. Suggest it be added to [QRH] index under 'O': oxygen system malfunction. Declared an emergency and we were cleared direct to ZZZ1. Landed without incident; cancelled emergency on landing. Taxiied to gate. Aircraft out of service (OTS). Leak was slow enough it was not possible for crew to detect before takeoff. If crew O2 bottle has been replaced two days in a row. Delay departure for a period of time before release for crew O2 leak check. Airline transport pilot (ATP).

Original NASA ASRS Text

Title: A Captain and First Officer report about the loss of their crew O2 bottle pressure that read 'Zero' in cruise at FL300. Maintenance had replaced the crew O2 bottle and First Officer's oxygen mask regulator on their MD-83 aircraft prior to departure.

Narrative: Maintenance had replaced crew O2 bottle and First Officer Mask Regulator in ZZZ. [We were] approaching an intersection; arranged for a bathroom break. First Officer found his oxygen inoperative and the crew bottle at zero. Coordinated for a descent and ran QRH. Procedure is under MISC and is not in index [of QRH]. Suggest it be added to [QRH] index under 'O': Oxygen System malfunction. Declared an emergency and we were cleared direct to ZZZ1. Landed without incident; cancelled Emergency on landing. Taxiied to gate. Aircraft Out of Service (OTS). Leak was slow enough it was not possible for crew to detect before takeoff. If crew O2 bottle has been replaced two days in a row. Delay departure for a period of time before release for Crew O2 Leak Check. Airline Transport Pilot (ATP).

Data retrieved from NASA's ASRS site 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.

A captain and first officer report about the loss of their crew O2 bottle pressure that read 'zero' in cruise at FL300. Maintenance had replaced the crew O2 bottle and first officer's oxygen mask regulator on their md-83 aircraft prior to departure.