What is the primary duty of the First Officer on a flight?

The primary duty of the First Officer, often referred to as the co-pilot, is to assist the captain in operating the aircraft. This role is crucial for ensuring the safety and efficiency of the flight operation. The First Officer helps with flying the aircraft, managing communication with air traffic control, and monitoring instruments and systems. They are trained to take over if necessary, ensuring that the aircraft is in capable hands at all times.

This teamwork is vital in maintaining situational awareness and sharing the responsibilities of flying, which includes pre-flight checks, navigating, and handling emergency situations, should they arise. The collaborative dynamic between the First Officer and the captain not only enhances safety but also allows for a more effective management of the flight overall.

The other roles mentioned, such as piloting the aircraft solo, managing cabin crew, or conducting safety checks, do not encapsulate the core function of a First Officer, who fundamentally supports the captain's command while sharing the flying responsibilities.