When should chocks be placed according to safety regulations?

Chocks are essential pieces of equipment used to prevent the accidental movement of aircraft and vehicles, particularly when they are stationary. According to safety regulations, chocks should always be in place when an aircraft or vehicle is not in motion. This practice enhances safety by ensuring that the vehicle remains securely in position, particularly in environments where uneven surfaces or external forces (like wind) could cause it to move unexpectedly.

Placing chocks at all times significantly reduces the risk of accidents and injuries related to unintended rolling or shifting, creating a more secure environment for personnel and equipment. Safety protocols consistently prioritize preventive measures, making the practice of always using chocks vital for maintaining operational safety in aviation and ground operations. The other options do not advocate for the consistent use of chocks, which is why they do not align with established safety standards.