What flap configuration should be used when performing the slow flight maneuver?

When performing the slow flight maneuver in the T-6B, the correct flap configuration is landing (LDG) flaps. This configuration is selected to increase the aircraft's lift capabilities at lower speeds, ensuring better control and stability during the maneuver. The landing flaps provide a greater camber to the wing, allowing for a reduced stall speed, which is essential when flying at slower airspeeds.

Using landing flaps also provides the necessary lift to maintain level flight with a higher angle of attack, which is critical for slow flight practice. This setup helps pilots gain experience in operating the aircraft near its stall speed while still being able to manage control inputs effectively.

Other flap configurations, such as takeoff flaps, no flaps, or full flaps, do not create the optimal conditions for slow flight. Each of these has different aerodynamic characteristics that either do not enhance lift adequately for the slow flight or could lead to undesirable handling characteristics during such a critical maneuver.