What is the minimum distance to maintain behind an aircraft with engines running?

The minimum distance to maintain behind an aircraft with engines running is 200 feet. This distance is crucial for safety due to the hazardous effects of jet exhaust, which can create significant turbulence and potentially cause injury or damage to personnel and equipment. Jet blast can propel debris and create wind shear conditions that could be hazardous, especially for smaller aircraft or ground personnel. Maintaining a distance of 200 feet helps ensure a safe zone where individuals and equipment can avoid the adverse effects associated with an aircraft's running engines.

While the other distances mentioned may seem reasonable, they do not adequately account for the risks posed by the powerful thrust and potential hazards, which is why the standard has been established at 200 feet.