How many types of FIS facilities are described?

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (B)

Flight Information Service facilities are described in three distinct kinds, each serving a different scale of airspace and phase of flight. One type provides information for en-route operations across the airway network, another covers the terminal area around airports (approach and departure), and the third handles information at the aerodrome level to support arrivals and departures. These three scopes together represent the full set described, so three is the right count. Two would miss one of the scopes, while four or five would imply additional categories not described in the material.