Avianca flight AV018, a Boeing 787-8 Dreamliner, was descending Barcelona Airport through FL260 when the aircraft?s speed increased to a value approaching the maximum permissible operating speed (VMO) while the commander, who was the pilot at the controls (PF), was making a passenger announcement. To reduce the speed, the commander extended the speed brakes, disengaged the autopilot and pulled the control column, registering, at that moment, a maximum vertical acceleration of +2.14 g. The commander?s actions on the control column caused the aircraft?s vertical acceleration to change from a maximum of +2.14 g to a minimum of +0.69 g, causing serious injuries to a passenger and a member of the cabin crew. The aircraft continued its flight without further incident and landed at Barcelona Airport. The injured occupants were transferred to a hospital. The investigation has concluded the probable cause of the accident was the set of actions taken by the pilot at the controls (PF) to prevent the aircraft from exceeding the maximum permissible operating speed (VMO), which resulted in the abrupt change in vertical acceleration that seriously injured a passenger and a member of the cabin crew.