B737-800
Maintenance Powerplant; Maintenance Airframe
Maintenance Lead Technician 29
Distraction; Workload; Situational Awareness; Confusion; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Human Factors; MEL
[I] addressed a deferred item on Log page XXX [for] (fuel panel leaking). [I] replaced fuel tank Access Panel 632MB on right wing. [I] should have replaced 532MB on the left wing. [I] discovered the mistake shortly after changing panel 632MB. [I] replaced the correct panel 532MB and leak checked. Note: aircraft did not fly; mistake was discovered and corrected quickly. [Also] had three aircraft go out of service in the same time period. Had another aircraft with a problem on the right hand side and inadvertently confused the aircraft.
A Lead Mechanic reports he inadvertently replaced right wing Fuel Access Panel 632MB on a B737-800 aircraft; instead of the left wing Fuel Access Panel 532MB to address a deferred item for a fuel panel leaking.