When do you slow down to holding speed?

Slowing down to holding speed is critical for ensuring a smooth and safe entry into a holding pattern. The correct choice indicates that you should begin to reduce your speed three minutes before reaching the fix. This timing allows adequate opportunity to decelerate while maintaining a stable and controlled approach to the holding pattern.

Three minutes prior to the fix is a standard practice that provides enough time to adjust your speed without rushing, considering the approach to the holding fix and any necessary configuration changes, such as flaps or trimming, needed for safe operations. This method aligns with standard procedures to prepare for arrival at the fix within the established holding pattern, ensuring you arrive at the correct altitude and speed while maintaining safe separation from other aircraft.

Other time frames would not provide sufficient time for a safe and controlled reduction in speed, which could lead to complications in managing the aircraft's approach to the holding pattern.