Can the speed brake be stopped at an intermediate deflection?

The assertion that the speed brake cannot be stopped at an intermediate deflection is based on the design and operational traits of the T-6A's speed brake system. When deployed, the speed brake has a specific range of motion where it fully extends and retracts due to its mechanically linked system.

This design ensures that the speed brake operates smoothly and predictably, providing consistent aerodynamic effects during flight. Once the speed brake is initiated, it either moves to the fully deployed or fully retracted position without the capability to pause at intermediate points. This operational characteristic is crucial for maintaining aircraft control and management during maneuvers where drag and lift need to be carefully balanced.

Thus, the ability to maintain control over the speed brake during operations stems from this built-in limitation, reinforcing the necessity of the system's intentional design.