A line mechanic removed and replaced a crew oxygen bottle on a B737-300 aircraft at the gate. While ...

Narrative:

I received a gate call; understanding that the crew oxygen bottle was low. Understanding that I did not have enough time to service it I grabbed a bottle from the stock room and proceeded to the aircraft to the right/right (remove and replaced) bottle. Completed task and signed-off aircraft logbook and headed back to the office. Upon completely filling out form X and looking over all paperwork I then realized the part effectivity did not match my aircraft model number. [I] immediately notified lead mechanic and called operations to stop aircraft from leaving gate...but it was too late as aircraft was gone. I did not think to check our maintenance/parts effectivity computer system as I did not know/think that the oxygen bottles were any different other than size and material.I had worked a 24-hour shift the day prior...but felt physically and mentally good at the time the event occurred. I do not normally work this shift and routinely service oxygen bottles on my normal shift. Ultimately my thoughts of 'limited time stress' and oversight of looking up parts effectivity and overlooking correct procedures caused my situation.

Original NASA ASRS Text

Title: A Line Mechanic removed and replaced a crew oxygen bottle on a B737-300 aircraft at the gate. While completing the paperwork he realized the part effectivity for the bottle he installed did not match the aircraft model number. Aircraft had already departed.

Narrative: I received a gate call; understanding that the crew oxygen bottle was low. Understanding that I did not have enough time to service it I grabbed a bottle from the Stock Room and proceeded to the aircraft to the R/R (Remove and Replaced) bottle. Completed task and signed-off aircraft logbook and headed back to the office. Upon completely filling out Form X and looking over all paperwork I then realized the Part Effectivity did not match my aircraft model number. [I] immediately notified Lead Mechanic and called Operations to stop aircraft from leaving gate...but it was too late as aircraft was gone. I did not think to check our Maintenance/Parts effectivity computer system as I did not know/think that the oxygen bottles were any different other than size and material.I had worked a 24-hour shift the day prior...but felt physically and mentally good at the time the event occurred. I do not normally work this shift and routinely service oxygen bottles on my normal shift. Ultimately my thoughts of 'limited time stress' and oversight of looking up Parts Effectivity and overlooking correct procedures caused my situation.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	921460
Time
Date	201011
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Parked
Component
Aircraft Component	Oxygen System/Crew
Person 1
Function	Technician
Qualification	Maintenance Airframe Maintenance Powerplant
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

A line mechanic removed and replaced a crew oxygen bottle on a B737-300 aircraft at the gate. While completing the paperwork he realized the part effectivity for the bottle he installed did not match the aircraft model number. Aircraft had already departed.