What is true regarding the DOWNE fix on the DOWNE4 Arrival?

The DOWNE fix on the DOWNE4 Arrival is associated with the Los Angeles International Airport (LAX) and is specifically defined by navigational parameters that guide arriving aircraft into the airport. The DOWNE fix is indeed aligned with LAX R-068 and 16 DME, which indicates that it is located on a radial from the LAX VOR at a specific distance.

This information is crucial for pilots and air traffic controllers when managing arrivals, as it provides a clear point of reference and helps ensure safe and effective route navigation into the busy airspace around LAX. The appropriate use of distance measuring equipment (DME) in conjunction with the radial enables accurate tracking of an aircraft's position relative to the DOWNE fix.

In contrast, the other options reference incorrect headings or distances in relation to the DOWNE fix, making them unsuitable choices for defining this specific waypoint in the arrival procedure. Understanding these specific references helps in grasping the aerodynamic navigation necessary for successful operations into one of the world’s busiest airports.