What should be the first action taken during a disruptive passenger incident in flight?

During a disruptive passenger incident in flight, the first action that should be taken is to identify the problem and notify the flight crew. This approach is critical because the flight crew is trained to handle such situations and can assess the level of threat and determine the appropriate response. By quickly informing the crew, they can implement their established protocols for dealing with disruptive behavior, which may involve involving additional crew members, contacting ground control, or taking other necessary measures to ensure the safety and security of all passengers and staff on board.

Clear communication between cabin crew and flight crew is essential in rapidly assessing the nature of the incident, as this allows for a coordinated response which is crucial in managing the situation effectively. Other actions, while potentially important, should follow this initial step to ensure that the right expertise is brought to bear on the problem at hand.