What is required when backing up within 25 feet of an aircraft?

When backing up within 25 feet of an aircraft, the requirements ensure the safety of both the vehicle and the aircraft. Having a spotter present is crucial because they can provide a clear line of sight and help guide the vehicle while backing up, reducing the risk of collisions with the aircraft or other obstacles in the vicinity.

Additionally, the need for a prepositioned chock serves as a safety measure. It can prevent the vehicle from rolling back unexpectedly and provide an additional point of reference for the driver. This dual requirement not only helps in maintaining control of the vehicle but also emphasizes the importance of communication between the driver and the spotter. Together, these precautions create a safer working environment around aircraft, which are sensitive and can be easily damaged.