What is the maximum airspeed to extend speed brakes?

The maximum airspeed to extend speed brakes on the T-6 is 250 KIAS. This limit is set to ensure the structural integrity of the aircraft and to maintain safe operational parameters. Extending the speed brakes at speeds higher than this can lead to excessive aerodynamic forces that may damage the aircraft, affect its control characteristics, or create unwanted drag, compromising the performance and safety of the flight. Understanding this limitation is crucial for pilots to utilize speed brakes effectively while ensuring that the aircraft remains within safe operational limits during all phases of flight.