What action is taken if No2 becomes incapacitated during the flight?

In the scenario where No2 becomes incapacitated during the flight, it is essential for the crew to maintain effective operation and safety. The correct action taken involves No1 remaining in position. This choice ensures that the most senior crew member continues to oversee the safety and management of the flight, providing stability and leadership during the emergency.

No1's role is critical as they are often responsible for coordinating the crew's actions and ensuring the safety of all passengers. By staying in position, No1 can delegate tasks or respond to the situation with the necessary authority and experience.

The other options involve crew members changing roles in ways that could complicate the chain of command or disrupt the cabin crew's workflow. For example, the duties of No2 should not be immediately reassigned to a less senior crew member without first ensuring that the most qualified person, in this case, No1, is leading the response. This structure helps to maintain order and reduces the likelihood of further complications during a crisis.