What action should cabin crew take upon receiving a flashing red light and 3 hi/lo chimes?

When cabin crew receive a flashing red light accompanied by three hi/lo chimes, it signifies a potential emergency situation requiring immediate attention. The flashing red light indicates an urgent situation that should not be ignored, and the accompanying chimes serve as an audible alert that signifies the necessity for the crew to act promptly.

In this scenario, the most appropriate action is to alert the flight deck crew of a potential emergency. This is critical as the flight deck is responsible for managing the overall safety and operation of the aircraft, and they need to be informed of any developing issues so they can make informed decisions regarding the situation, including whether to prepare for an evacuation or take other necessary actions.

While other actions, such as calling for passenger assistance or preparing for a possible evacuation, may be relevant in different circumstances, the immediate priority should be to communicate with the flight deck. This ensures that the entire crew is working in concert to manage the emergency effectively, prioritizing the safety of all onboard.