Narrative:

Outside air temperature was one hundred plus degrees. Carrying on an exchange with another technician while performing work; I was tasked with servicing the crew oxygen bottle since it was below the minimum value for the service check limit. Referencing M/M 12-15-21 for the servicing limits; I proceeded to the forward pit of the B737-800 to gain access to the O2 panel. As I have done for years; I removed the bottle from the airplane and brought it to the servicing station where it was filled to the specifications as outlined by the manual. After returning to the aircraft with the serviced O2 bottle; I began reinstalling the bottle. During the final steps of the crew O2 bottle installation; I had started a discussion with a fellow technician at the open (cargo) pit door. After fastening the blow-out line and regulator to the bottle; in my mind; I recall opening the valve to the full open position and then; back in a quarter turn; before installing the break-away wire. I don't recall removing my hand from the valve after beginning to open it. I performed the leak check after securing all connections and all checked out good. Our conversation had carried through to completion of the bottle install.as we were walking away from the aircraft; I asked my fellow technician to perform the functional test while I proceeded to the office to address the paperwork. He acknowledged that he would perform the test and I went to the office. I filled out the log page with the appropriate information about the crew O2 reading and the applicable servicing that was accomplished. The functional test was performed and signed by a separate technician and I finished the log page by signing-off the resolution box.

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Original NASA ASRS Text

Title: Two Mechanics describe their involvement with the servicing of a B737-800 Crew Oxygen Bottle.

Narrative: Outside air temperature was one hundred plus degrees. Carrying on an exchange with another technician while performing work; I was tasked with servicing the crew oxygen bottle since it was below the minimum value for the service check limit. Referencing M/M 12-15-21 for the servicing limits; I proceeded to the forward pit of the B737-800 to gain access to the O2 panel. As I have done for years; I removed the bottle from the airplane and brought it to the servicing station where it was filled to the specifications as outlined by the manual. After returning to the aircraft with the serviced O2 bottle; I began reinstalling the bottle. During the final steps of the crew O2 bottle installation; I had started a discussion with a fellow technician at the open (cargo) pit door. After fastening the blow-out line and regulator to the bottle; in my mind; I recall opening the valve to the full open position and then; back in a quarter turn; before installing the break-away wire. I don't recall removing my hand from the valve after beginning to open it. I performed the leak check after securing all connections and all checked out good. Our conversation had carried through to completion of the bottle install.As we were walking away from the aircraft; I asked my fellow technician to perform the functional test while I proceeded to the office to address the paperwork. He acknowledged that he would perform the test and I went to the office. I filled out the log page with the appropriate information about the crew O2 reading and the applicable servicing that was accomplished. The functional test was performed and signed by a separate technician and I finished the log page by signing-off the resolution box.

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.