What phrase does the captain use to notify the cabin crew of an emergency?

The captain uses the phrase "N1 to the flight deck" to notify the cabin crew of an emergency. This phrase is part of the standardized communication protocols used in aviation, where "N" signifies that the message pertains to the cabin crew. The designation "1" indicates that this is a priority notification related to an emergency situation.

Using this specific phrase allows for clarity and urgency in communication, ensuring that the cabin crew understands the seriousness of the situation and can respond appropriately. This standardized language helps maintain consistency across different flights and scenarios, which is critical for safety and effective operation during emergencies.