What action should N2 take when they hear "N1 to the flight deck" during boarding or disembarking?

When N2 hears "N1 to the flight deck," the appropriate action is to pick up the intercom. This is essential because the announcement indicates that N1 needs to communicate with colleagues in the flight deck, likely regarding an important issue or situation that requires attention. By picking up the intercom, N2 can facilitate and ensure that critical communication happens smoothly.

This context is particularly important during boarding or disembarking when the flight crew must maintain safety and coordination. Communication is key in these situations, allowing N2 to be informed about any changes or specific actions needed promptly. Other options, such as continuing to board passengers or securing cabin doors, may detract from the immediate need to establish communication in response to the announcement.