When may you initiate the approach procedure after being radar vectored?

The appropriate time to initiate the approach procedure after being radar vectored is when cleared by air traffic control. This is crucial because air traffic control has the responsibility to ensure that the aircraft is properly sequenced and that the approach is safe and clear of other air traffic. The clearance from air traffic control indicates that the pilot can begin the approach procedure, taking into account the specific circumstances and safety protocols at that moment.

While establishing the final approach course is an important part of the procedure, it does not, by itself, grant the authority to initiate the approach. The confliction point refers to a location that may involve other traffic, and reaching the initial approach fix is part of the approach procedure but does not necessarily allow the approach to commence unless specifically cleared. Thus, the only time the pilot has the authorization to start the approach is when they receive explicit clearance from air traffic control.