Narrative:

Aircraft X; a B737-400; was found with corrosion on the intercostal at the aft end common to body station (bs) 986.50 floor beam. This corrosion was visible while standing on the ground looking up through the open outflow valve. This was written up [in the logbook]. At this time it was believed the corrosion was more then simple surface corrosion and extended between the floor and the floor beam; extensive photos were taken by inspection at this time. The area in question also contained some re-work; a roughly trimmed cutout in the intercostal that had been made for the hi-lok to clear. The job was turned from graveyard [shift] to dayshift at the morning meeting. At this meeting it was understood by the off-going shift that the aircraft was to be ferried elsewhere for the repair of the floor beam due to the extensive nature of the work.after the turn over it was noted that the dayshift manager and the dayshift airframe supervisor were at the aircraft and observing the area of the discrepancy. The sign-off of the discrepancy was done on a write-up. The corrosion removal was done by a graveyard mechanic who had stayed over for an engine run on another aircraft. This mechanic said he did not see any rough re-work area and only removed surface corrosion from the area. A dayshift mechanic signed-off the painting of the area and another dayshift mechanic signed-off the entire job. There is no documentation that the airframe shop had evaluated or worked this discrepancy. [Later] in the evening; it was noted by the graveyard mechanics that the aircraft was in revenue service and apparently the corrosion issue and the rough rework area had not been addressed. The original write-up did provide sufficient detail of the discrepancy and the turn over at the morning [meeting] did not adequately cover the defects. The mechanic who removed the corrosion and the inspector were not aware of the detailed photos of the area.

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Original NASA ASRS Text

Title: A Lead Line Aircraft Maintenance Technician (AMT) and another AMT report about their involvement with a B737-400 aircraft that was released with known corrosion on the internal fuselage aft end; at the outflow valve area common to Body Station (BS) 986.50 floor beam. Aircraft later grounded and flight canceled.

Narrative: Aircraft X; a B737-400; was found with corrosion on the intercostal at the aft end common to Body Station (BS) 986.50 floor beam. This corrosion was visible while standing on the ground looking up through the open Outflow Valve. This was written up [in the logbook]. At this time it was believed the corrosion was more then simple surface corrosion and extended between the floor and the floor beam; extensive photos were taken by Inspection at this time. The area in question also contained some re-work; a roughly trimmed cutout in the intercostal that had been made for the Hi-Lok to clear. The job was turned from graveyard [shift] to dayshift at the morning meeting. At this meeting it was understood by the off-going shift that the aircraft was to be ferried elsewhere for the repair of the floor beam due to the extensive nature of the work.After the turn over it was noted that the Dayshift Manager and the Dayshift Airframe Supervisor were at the aircraft and observing the area of the discrepancy. The sign-off of the discrepancy was done on a write-up. The corrosion removal was done by a Graveyard Mechanic who had stayed over for an engine run on another aircraft. This Mechanic said he did not see any rough re-work area and only removed surface corrosion from the area. A Dayshift Mechanic signed-off the painting of the area and another Dayshift Mechanic signed-off the entire job. There is no documentation that the Airframe Shop had evaluated or worked this discrepancy. [Later] in the evening; it was noted by the Graveyard Mechanics that the aircraft was in revenue service and apparently the corrosion issue and the rough rework area had not been addressed. The original write-up did provide sufficient detail of the discrepancy and the turn over at the morning [meeting] did not adequately cover the defects. The Mechanic who removed the corrosion and the Inspector were not aware of the detailed photos of the area.

Data retrieved from NASA's ASRS site as of July 2013 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.