How close can a vehicle be to an aircraft when engines are not running?

When aircraft engines are not running, vehicles can typically approach much closer than when engines are operating. However, the exact distance can vary based on airport regulations, safety protocols, and specific aircraft types. Generally, a safe distance of at least 25 feet (7.5 meters) is recommended to avoid potential hazards, such as equipment or servicing needs. Always consult local regulations and guidelines for specific requirements.