A power reduction will usually necessitate what type of trim adjustments?

When reducing power in the T-6B, it is common to experience a change in the aircraft's performance characteristics, especially in terms of pitch attitude and yaw. A power reduction tends to lead to a decrease in the thrust produced by the aircraft's engine, which often results in a slight forward pitch due to the reduced lift created by the wings at a lower airspeed.

To counteract this forward pitching tendency, the pilot would adjust the elevator trim to apply a slight upward force on the controls, effectively trimming the aircraft for a balanced flight attitude after the power reduction. This is why making upward adjustments to the trim is necessary following a reduction in power.

Furthermore, during power reductions, as drag increases and airspeed decreases, the aircraft may also initially yaw to the left due to the propeller's spiraling slipstream that affects the vertical stabilizer. Trimming to the left can help mitigate any unwanted yaw, helping to maintain coordinated flight.

Thus, when considering both the necessary adjustments for both yaw and pitch following a power reduction, the appropriate trim adjustment is to move the elevator trim up and the aileron trim left, leading to the conclusion that the correct answer is indeed related to a left and upward trim adjustment.