In a cabin temperature situation where the captain is unreachable, what should you do next?

In the situation where the captain is unreachable and there is a concern about the cabin temperature, informing all flight attendants is the most appropriate action to take. This step is crucial because all flight attendants need to be aware of the situation so they can collectively manage the passengers' comfort and safety. By informing the crew, it ensures that they are prepared to monitor the situation more effectively and address any concerns raised by passengers, providing a united front and a clear communication channel.

This approach also allows the flight attendants to collaboratively decide on immediate actions. They might implement measures to mitigate discomfort, such as adjusting air conditioning vents, offering water, or preparing to communicate with passengers about the situation. Additionally, this creates the opportunity for the team to brainstorm solutions or relay information back to the captain if they regain communication.

The other options do not prioritize team communication or collective action. Notifying passengers may cause unnecessary concern, while simply monitoring the temperature without action could lead to worsening discomfort among passengers. Stopping all intercom communications would also reduce the ability to disseminate important information in a timely manner.