What happened
The aircraft was operating in smooth air while maintaining straight and level flight. The 'fasten seat belt' warning sign was illuminated during this phase of the operation. A male passenger proceeded to the forward lavatory, where he experienced a fall. This incident resulted in injuries to his head and back.
The investigation
Investigators examined the condition of the lavatory floor immediately following the event. They confirmed that the flooring was dry and free of any loose or torn carpeting. There were no other loose objects present in the area that could have contributed to a slip or stumble. Despite these checks, the specific reason for the fall remained undetermined.