When en route from DBS VORTAC to JAC VOR/DME on V520, when should you change VOR frequencies?

The correct answer is based on the standard practice of changing VOR frequencies during an IFR flight. When flying en route and transitioning from one VOR station to another, pilots typically switch frequencies based on the distance from the originating VOR (in this case, DBS VORTAC). The rationale for changing the frequency at approximately 60 nautical miles from the DBS VORTAC is that this distance allows ample time for the pilot to familiarize themselves with the new VOR information, ensuring a smooth transition to the incoming signal.

At this range, the pilot can ensure that they are well within the coherent range of the new VOR facility. This also helps in maintaining situational awareness and reduces the potential for confusion when navigating. By switching at this distance, pilots give themselves enough time to verify the accuracy of the newly tuned frequency and establish the proper navigation toward the JAC VOR/DME.

Choosing to change frequencies at a distance that is either closer or further may lead to disruptions in navigation or could result in missing critical information related to the upcoming waypoints, particularly in busy airspace or when flying at higher speeds. Thus, changing the frequency at 60 NM from the DBS VORTAC is a prudent decision, aligning with recommended practices for safe navigation en