The primary instrument used to display VOR frequency information is the

• A. HSI portion of the PFD
• B. NAV display
• C. Upper portion of the PFD
• D. TSD display

Answer: (A)

The main idea is that navigation information tied to a VOR is presented most effectively on the HSI portion of the PFD. The HSI combines the aircraft’s heading with a rotating course indicator and the bearing to the tuned VOR, so you can see exactly which course to fly relative to the VOR and whether you’re TO or FROM it. When a VOR is tuned, the NAV system feeds this information to the HSI, making it the central, quickest way to interpret and fly using VOR signals.

The other displays serve different roles: the NAV display can show tuning data, the upper portion of the PFD is typically attitude-related, and the TSD shows terrain and related information. They don’t present the VOR navigation cue as directly and integrally as the HSI does, so the HSI is the best single instrument for using VOR information.