Final answer:
The minimum distance for non-crushable objects from the Arresting Gear Placed In Position (AIP) at military airfields is usually at least 250 feet, ensuring the safety of personnel and the integrity of the arresting system.
Step-by-step explanation:
The minimum distance that non-crushable objects must be placed from the Arresting Gear Placed In Position (AIP) varies depending on specific regulations and the type of facility. However, for military airfields using arresting gear systems, the standard distance is often set at a minimum of 250 feet from the AIP. This safety margin is provided to ensure that in the event of an arrestment, the arresting gear has enough space to stop the aircraft without any risk of impacting non-crushable objects. These regulations are designed to protect both ground personnel and equipment, as well as to maintain the structural integrity of the arresting system itself.