A B737-900 arrived on gate with crew oxygen indicating zero. Found oxygen level within limits. Suspect installation of connector on bottle pressure transmitter.

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Attributes
ACN	636385
Time
Date	200410
Day	Thu
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-900
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
ASRS Report	636385
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	aircraft equipment other aircraft equipment : oxygen press indicator other other : 2
Resolutory Action	none taken : detected after the fact
Consequence	other other
Factors
Maintenance	performance deficiency : testing
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

I received aircraft X and was assigned the service check. It has been brought to my attention that the oxygen read zero when it arrived at the gate. When accomplishing service check, I checked oxygen and oxygen level was within limits when I checked it. Suspect improper installation of cannon plug upon prior servicing of oxygen bottle.

Original NASA ASRS Text

Title: A B737-900 ARRIVED ON GATE WITH CREW OXYGEN INDICATING ZERO. FOUND OXYGEN LEVEL WITHIN LIMITS. SUSPECT INSTALLATION OF CONNECTOR ON BOTTLE PRESSURE XMITTER.

Narrative: I RECEIVED ACFT X AND WAS ASSIGNED THE SVC CHK. IT HAS BEEN BROUGHT TO MY ATTN THAT THE OXYGEN READ ZERO WHEN IT ARRIVED AT THE GATE. WHEN ACCOMPLISHING SVC CHK, I CHKED OXYGEN AND OXYGEN LEVEL WAS WITHIN LIMITS WHEN I CHKED IT. SUSPECT IMPROPER INSTALLATION OF CANNON PLUG UPON PRIOR SVCING OF OXYGEN BOTTLE.

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.