To transition for a landing-flap setting, when should power reduction occur?

The correct approach to transition for a landing-flap setting involves reducing power during the appropriate phase of flight for a safe and controlled descent. Reducing power to approximately 20% torque when abeam the intended landing point allows for a gradual descent and controlled airspeed. This point in the flight path is crucial because it offers a clear visual reference and allows for adjustments as needed without entering an uncontrolled descent or overshoot.

By reducing the power at this point, the pilot can maintain better control of the aircraft's approach angle and prepare for the landing configuration. This technique also helps in managing the aircraft's descent rate more effectively, striking a balance between maintaining lift and descending towards the runway.

Other options propose either a different power reduction percentage or suggest reducing power at an earlier phase (the 180° position) which may not provide the desired control over the descent rate and approach path as effectively as the correct choice does.