In a procedure turn, are the headings shown by the barb mandatory?

The correct choice reflects that while the headings indicated by the barb in a procedure turn are not mandatory, they serve as a guideline to ensure that the turn is executed on the correct side of the course. This is crucial for maintaining proper separation and avoiding conflicts with other aircraft or airspace restrictions.

Procedure turns are designed to provide a way to reverse course within a specified distance from a navigational fix while maintaining a safe and predictable flight path. Following the turn on the correct side, as indicated by the barb, helps pilots adhere to established routes and improve safety during the maneuver.

While some specific approaches or conditions may dictate stricter adherence to the barb, generally, it is the requirement to make the turn on the appropriate side that must be observed to ensure compliance with the procedure and safe operation within the airspace.