When someone starts a fight in the back row during cruise, how should you inform the flight deck?

The correct response to inform the flight deck about a disturbance, such as a fight in the back row during cruise, is to use four high-low chimes. This method is a standardized signal that alerts the flight deck to an emergency situation or a significant incident occurring on the aircraft. The high-low chimes are specifically designed to catch the attention of the pilots, communicating the urgency of the situation without needing to use verbal communication, which may be less effective or timely in a chaotic environment.

Using the intercom or calling the flight deck directly may not be suitable in a fast-moving situation where immediate notification is crucial, and texting is not an accepted method for urgent communication in aviation protocols. The standardized chime system ensures that the alert is clear and recognized immediately, allowing the flight crew to respond appropriately to the situation.