For IFR departures, unless a higher climb gradient is published, what must USAF aircraft comply with?

For IFR departures, USAF aircraft are required to comply with a standard climb gradient of 200 feet per nautical mile unless a higher climb gradient is specified in published procedures. This requirement is in place to ensure safe separation from terrain, obstacles, and other air traffic during the initial stages of flight after takeoff. The climb gradient represents the necessary vertical altitude gain per horizontal distance traveled and is crucial for maintaining safe operational standards.

In the absence of specific obstacles or flight rules that dictate a different gradient, operating at 200 feet per nautical mile provides a reliable and standardized approach for pilots to follow. This also helps in flight planning and coordination with air traffic control, ensuring that all aircraft adhere to the same expectations for climb performance under IFR procedures, enhancing overall safety in the airspace.