An upgraded reservation system, utilized by TUI, developed a critical fault prior to an incident flight. This system was responsible for generating the aircraft’s load sheet, a vital document for ensuring flight safety and proper weight distribution.

The core of the issue stemmed from a software defect that caused female passengers, specifically those checked in with the title ‘Miss’, to be erroneously classified as children. Consequently, the system assigned them a child’s standard weight of 35 kg, rather than the correct female standard weight of 69 kg.

This miscategorization affected 38 female passengers on the G-TAWG flight. The cumulative effect was a significant underestimation of the aircraft’s takeoff mass, with the load sheet indicating 1,244 kg less than the actual mass of the aircraft.

The provided information does not detail the specific timeline of the incident flight or the subsequent remediation actions taken to correct the fault in the reservation system.