B737-700
Maintenance Airframe; Maintenance Powerplant; Other RII Inspector
Confusion
Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
While performing task card Passenger Compartment Seat Installation in conjunction with the STA (Station) 540 slot sealant inspection seat row 12ABC was inadvertently reinstalled in the wrong seat row position. Although we do not remove seat row 13ABC for this inspection; somehow row 13ABC and 12ABC were in swapped positions as reported by an inflight crew member due to tray table operation being impaired due to the armrest tray table seat row being installed in the wrong seat row position. Although I know I verified part numbers and serial numbers of all rows of seats after they were removed to facilitate the STA 540 slot sealant inspection; I cannot be certain that I verified part number and serial number of seat row 12ABC after final installation as required per the task card step. Seat row 12ABC being swapped with 13ABC is an anomaly that I can not explain as we do not remove seat row 13ABC during this process. I understand that I could have possibly transposed part numbers during my inspection and let the incorrect part number get reinstalled in the wrong position if that seat row arrived in the wrong position which is the only way I can account for this seat row being in the incorrect position per the drawing as we never removed row 13ABC.
Maintenance Technician reports that passenger seat row was installed in the wrong position.