The pilot-in-command (PIC) stated that they were flying at 4,000 feet msl over Lake Pontchartrain when the flight crew heard a bang. The pilots thought that they had experienced a bird strike, and they landed uneventfully at New Orleans. Post flight examination of the left wing revealed that the left wing's fuel vent was blocked with duct tape, and the wet wing fuel tank had collapsed. The fuel tank stringers and the wing ribs sustained structural damage. The PIC stated that the fuel tanks had been repaired and pressure tested prior to the flight. The PIC added that after the pressure test, the mechanic, who repaired the fuel tank, removed the tape from the right wing's fuel vent; however, both the mechanic and the flight crew failed to notice the duct tape over the left wing's fuel vent. The flight crew stated that there were no streamers or markers present to indicate that the fuel tank vent was covered with duct tape.
The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
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