What is the immediate action cabin crew must take during a pressure leak?

The immediate action cabin crew must take during a pressure leak is to advise the flight crew. This is important because the flight crew needs to be informed of the situation to make necessary adjustments to the aircraft's operations, such as descending to a lower altitude where the air pressure is stable and the air is breathable. Prompt communication with the flight crew ensures that they can assess the severity of the pressure leak and initiate appropriate emergency procedures if necessary.

Advise the flight crew also aids in coordinating a response and preparing for any required actions by the cabin crew and passengers, such as the deployment of oxygen masks if conditions worsen. Each crew member's role is essential in maintaining safety and handling the situation efficiently.

While options like checking oxygen masks and closing all cabin doors may be relevant actions that could follow, the priority is to ensure the flight crew is informed as they may need to make quick decisions regarding altitude changes or other emergency responses. Starting cabin evacuation is typically reserved for more severe scenarios after assessing the situation and coordinating with the flight crew.