Which of the following is true for alternate aerodrome operations?

• A. The alternate must be served by a GPS-based approach.
• B. The alternate must be served by a non-GPS approach.
• C. The alternate must have at least two runways.
• D. The alternate must be located within 50 nautical miles.

Answer: (B)

Alternate planning relies on having an alternate airport that can be used safely even if GPS is unavailable. The reason this matters is that you want a dependable way to reach the runway using conventional navigation aids, so there must be an instrument approach at the alternate that does not rely solely on GNSS. A non-GPS approach—such as one based on VOR, NDB, or localizer—provides that backup capability in case satellite navigation is degraded or out. The other ideas—needing GPS-only approaches, requiring two runways, or a fixed distance like 50 nautical miles—are not universal requirements for selecting an alternate.