Which approach minimums should be used by a pilot in a Category B airplane maintaining a speed faster than the maximum specified for that category when circling to land?

In scenarios where a Category B airplane is operating at a speed that exceeds the maximum specified for that category while circling to land, the pilot should apply the approach minimums that are set for Category C. This is primarily due to the increased maneuverability and broader turn radius expected from aircraft in a higher speed category (C).

When a Category B aircraft operates above specified speeds, the performance characteristics align more closely with those of Category C aircraft, which is designed for a faster approach and requires more significant spacing and considerations during landing. Circling minimums are designed to ensure the aircraft can safely maneuver in the conditions dictated by those higher approach speeds; thus, using Category C minimums ensures that the pilot has adequate visibility and safety margins while conducting the circling maneuver in potentially varied conditions.

It's important for pilots to always adhere to the higher minimums to ensure a safe approach, especially in circling situations where terrain and obstacles may require more precise control and decision-making.