What is the minimum climb gradient required for USAF aircraft during IFR departure procedures?

The minimum climb gradient required for USAF aircraft during IFR departure procedures is 200 feet per nautical mile. This standard is set to ensure that aircraft can safely clear obstacles during the initial climb phase after takeoff. A climb gradient of 200 feet per nautical mile equates to a 3.8% slope, which is a crucial requirement given potential obstruction environments around airfields.

This gradient helps maintain a safe altitude over terrain and obstacles, allowing sufficient vertical separation to avoid hazards. It is based on operational needs and is aligned with standard practices in military and civilian aviation, ensuring that pilots can execute departure procedures safely and efficiently under instrument flight rules.