The data refers to ultrasonic guided wave (GW) measurements on a full-scale composite torsion box stiffened panel. The panel was subjected to realistic low-energy impacts in different critical locations in order to obtain barely-visible impact damage (BVID) of different severities. The purpose of the study was to assess the diagnostic capabilities of the GW based structural health monitoring (SHM) system, which was designed according to a newly developed systematic multi-parameter methodology. Hence, the diagnostic capability assessment served also the purpose of validating the SHM system design methodology. The data in this dataset was collected in the Netherlands Aerospace Centre – NLR, located in Marknesse, the Netherlands, and was integrated in the Thermoplastic Affordable Primary Aircraft Structure 2 (TAPAS 2) project, financed by the Netherlands Enterprise Agency of the Ministry of Economic Affairs