Which condition does NOT allow for a procedure turn?

A visual approach request does not permit a procedure turn because such approaches are designed for pilots to fly directly to the airport from a predetermined point, typically with visual references, and often involve specific air traffic control (ATC) instructions based on the visual environment. Since the visual approach aims to facilitate direct and efficient arrival, executing a procedure turn, which is a maneuver designed to reverse direction, would contradict the intent of a streamlined visual approach.

In contrast, other scenarios listed, such as being radar vectored to the final approach course, timed approaches, or holding in lieu of a procedure turn, all recognize the need for more complex navigation or air traffic control management, where a procedure turn may still be warranted to establish proper spacing or alignment with the approach path. In a visual approach, the priority is on maintaining a clear view of the runway and surrounding environment, rendering the procedure turn unnecessary and impractical.