A B737-300 was found with 500 psi on crew oxygen. Robbed B737-700 crew oxygen bottle and installed i...

Attributes
ACN	666529
Time
Date	200507
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance ground : parked
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	666529
Person 2
Affiliation	company : air carrier
Function	oversight : coordinator
ASRS Report	667138
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : crew oxygen pressure indicator other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Chart Or Publication Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

I was on a road trip. Aircraft was grounded for a hydraulic leak. After we repaired aircraft it was towed to the gate and we turned it over to the flight crew. Approximately 30 mins later; we were called back to the gate. The plane was full of passenger and the flight crew told us there was only 500 psi on the crew oxygen. Called maintenance control and they said to rob the oxygen bottle from aircraft Y. Told them he didn't think we could use a -700 oxygen bottle on a -300. They said yes we could. When I was filling out the logbook; I called maintenance control. I asked if they were sure we could use a -700 bottle in a -300. They said yes. I asked again and told them this was a graphite bottle. They said yes we could and that the bottles had the same part numbers. We robbed the bottle and installed it on aircraft X. We had no access to parts catalog and effectivity computer program.

Original NASA ASRS Text

Title: A B737-300 WAS FOUND WITH 500 PSI ON CREW OXYGEN. ROBBED B737-700 CREW OXYGEN BOTTLE AND INSTALLED IN B737-300 ON DELAY. TECHNICIANS NOT SURE OF EFFECTIVITY.

Narrative: I WAS ON A ROAD TRIP. ACFT WAS GNDED FOR A HYD LEAK. AFTER WE REPAIRED ACFT IT WAS TOWED TO THE GATE AND WE TURNED IT OVER TO THE FLT CREW. APPROX 30 MINS LATER; WE WERE CALLED BACK TO THE GATE. THE PLANE WAS FULL OF PAX AND THE FLT CREW TOLD US THERE WAS ONLY 500 PSI ON THE CREW OXYGEN. CALLED MAINT CTL AND THEY SAID TO ROB THE OXYGEN BOTTLE FROM ACFT Y. TOLD THEM HE DIDN'T THINK WE COULD USE A -700 OXYGEN BOTTLE ON A -300. THEY SAID YES WE COULD. WHEN I WAS FILLING OUT THE LOGBOOK; I CALLED MAINT CTL. I ASKED IF THEY WERE SURE WE COULD USE A -700 BOTTLE IN A -300. THEY SAID YES. I ASKED AGAIN AND TOLD THEM THIS WAS A GRAPHITE BOTTLE. THEY SAID YES WE COULD AND THAT THE BOTTLES HAD THE SAME PART NUMBERS. WE ROBBED THE BOTTLE AND INSTALLED IT ON ACFT X. WE HAD NO ACCESS TO PARTS CATALOG AND EFFECTIVITY COMPUTER PROGRAM.

Data retrieved from NASA's ASRS site as of January 2009 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 B737-300 was found with 500 psi on crew oxygen. Robbed B737-700 crew oxygen bottle and installed in B737-300 on delay. Technicians not sure of effectivity.