What is a common action taken when smoke is noticed in the flight deck during descent?

When smoke is noticed in the flight deck during descent, discussing the situation within the crew is crucial for effective management of the emergency. This communication allows the flight crew to assess the source of the smoke, determine the appropriate procedures to follow, and ensure that both pilots are aligned in their response to the situation.

Open communication can lead to a more thorough understanding of the issue, allowing for the evaluation of potential causes—such as electrical failures or environmental factors—and the development of a strategy to respond effectively. This collaborative approach can enhance situational awareness and improve decision-making during a critical phase of flight.

While the other options may seem plausible, they do not prioritize the necessary communication and evaluation steps that are essential in managing such emergencies. Continuing the descent without addressing the situation could exacerbate any problems, and immediately declaring an emergency and landing without a full assessment can lead to hasty decisions that may not be in the best interest of safety. Shutting down all electronic equipment might not only be unnecessary but also could lead to the loss of critical instruments needed for navigation and operation. Thus, discussing the situation within the crew is the most reasonable and responsible action.