What is the main purpose of placing chocks on an aircraft?

The main purpose of placing chocks on an aircraft is to secure the aircraft in place. Chocks are wedge-shaped blocks that are placed against the wheels of the aircraft to prevent it from rolling when it is parked. This is particularly important during loading and unloading processes, as well as during aircraft servicing, to ensure the safety of personnel and the equipment involved. By securing the aircraft, chocks help to prevent accidental movement or drifting, which could lead to dangerous situations, such as collisions or injuries.

In contrast, other options do not accurately reflect the primary function of chocks. For instance, while loading and unloading operations may be facilitated by chocks being in place, the main intention is to provide stability and not to increase speed. Similarly, chocks have no relevance to engine overheating issues or aiding in the unloading of cargo. Their primary and critical role is to maintain the aircraft's position on the ground safely and effectively.