What is the function of wheel chocks on an aircraft?

Wheel chocks serve a crucial safety function by securing an aircraft in place when it is parked or temporarily unattended. This prevents any unintentional movement of the aircraft, which could be caused by factors such as wind or potential mechanical failure. By using wheel chocks, ground crew can ensure that the aircraft remains stationary during boarding, maintenance, or loading operations, significantly reducing the risk of accidents or incidents.

The other options, while they touch on various aspects of aviation and ground operations, do not accurately reflect the primary purpose of wheel chocks. For instance, improving fuel efficiency or assisting with navigation does not relate to the immediate safety posture of an aircraft on the ground. Similarly, while proper procedures in cargo loading are essential, they do not involve the function of securing the aircraft against unintended movement, which is the distinct role of wheel chocks.