Final answer:
The procedure for moving an aircraft backward from an operational stand to an engine-start position is called Pushback.
Step-by-step explanation:
The procedure that involves a tug moving an aircraft backward from an operational stand to its engine-start position is known as Pushback. During this operation, an airport tug or tractor is attached to the nose wheel of the aircraft. The pushback is an essential process at airports for repositioning the aircraft without running its engines, primarily for safety and to save fuel. It requires coordination between the ground crew, the tug driver, and the aircraft pilots to ensure the process is carried out safely and efficiently.