Narrative:

While completing a service check on B757-200 aircraft; I was asked by mechanic X if I had a straight blade screw driver which was needed to open an oxygen panel in the aft lavatory. I went up on the aircraft and opened the panel for him. He expended (discharged) the lavatory [passenger] oxygen O2 generator. I asked him why he was doing that and he explained that there was an engineering order (ea) to expend and remove the oxygen generators from the lavatories onboard this aircraft. He said we should give the generator about an hour or two to cool down before we remove them. I finished the service check; we measured the brakes for the brake callout; and I put the equipment used for the service check away. I went on break and when I returned to the aircraft after break; the [aircraft] cleaners were onboard and heavy into cleaning. I saw mechanic X coming up the isle with an arm load of oxygen generators and he said the job was done. He was signed into the maintenance computer at sign-off for the work completed. He had helped with the service check and added time for that work along with my file number; he signed-off the brake check and measurement with both of our file numbers and gave us both time on that job card. He signed-off the engineering order and took time on that one; and added my file number to the sign-off. When the aircraft reached the terminal and the flight attendants began their checks; they found one of the spent oxygen generators still hanging from the ceiling of one of the lavatories. The aircraft took a delay but it was due to a different problem than the still installed oxygen generator.

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Original NASA ASRS Text

Title: A Line Mechanic performing maintenance on a B757-200 at company hangar reported a lavatory Oxygen Generator that was found hanging from the lavatory ceiling by a Flight Attendant after the aircraft had been returned to the terminal.

Narrative: While completing a Service Check on B757-200 aircraft; I was asked by Mechanic X if I had a straight blade screw driver which was needed to open an oxygen panel in the aft lavatory. I went up on the aircraft and opened the panel for him. He expended (discharged) the lavatory [passenger] Oxygen O2 Generator. I asked him why he was doing that and he explained that there was an Engineering Order (EA) to expend and remove the Oxygen Generators from the lavatories onboard this aircraft. He said we should give the generator about an hour or two to cool down before we remove them. I finished the Service Check; we measured the brakes for the Brake Callout; and I put the equipment used for the Service Check away. I went on break and when I returned to the aircraft after break; the [aircraft] cleaners were onboard and heavy into cleaning. I saw Mechanic X coming up the isle with an arm load of oxygen generators and he said the job was done. He was signed into the maintenance computer at sign-off for the work completed. He had helped with the Service Check and added time for that work along with my file number; he signed-off the Brake Check and measurement with both of our file numbers and gave us both time on that job card. He signed-off the Engineering Order and took time on that one; and added my file number to the sign-off. When the aircraft reached the terminal and the flight attendants began their checks; they found one of the spent oxygen generators still hanging from the ceiling of one of the lavatories. The aircraft took a delay but it was due to a different problem than the still installed oxygen generator.

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.