Why is only one VOR receiver required for the VOR/DME-A procedure?

Why is only one VOR receiver required for the VOR/DME-A procedure?

• A. Because VOR/DME uses only DME.
• B. All navigation for the procedure is from the White Cloud VORTAC.
• C. The other VOR receivers are not certified.
• D. DME provides the azimuth.

Answer: (B)

The key idea is that this approach relies on a single navigation facility for all guidance. A VOR/DME-A published procedure is designed so that the White Cloud VORTAC provides both the azimuth (via the VOR signal) and the distance (via DME) needed to fly the procedure. Since all nav data come from that one station, you only need one VOR receiver to tune the VOR portion and use the DME distance from the same station. DME does not give azimuth—it gives distance—so the azimuth information isn’t provided by DME. The chart text indicating navigation is from the White Cloud VORTAC means there’s no requirement to use additional VORs to fly the approach.

The key idea is that this approach relies on a single navigation facility for all guidance. A VOR/DME-A published procedure is designed so that the White Cloud VORTAC provides both the azimuth (via the VOR signal) and the distance (via DME) needed to fly the procedure. Since all nav data come from that one station, you only need one VOR receiver to tune the VOR portion and use the DME distance from the same station. DME does not give azimuth—it gives distance—so the azimuth information isn’t provided by DME. The chart text indicating navigation is from the White Cloud VORTAC means there’s no requirement to use additional VORs to fly the approach.