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On a sectional chart, a small white CIRCLE inside the airport symbol indicates
Choices
no services available.
White circle indicates a frequency, not a lack of services.
✓ the airport has either a UNICOM or another non-tower communication facility.correct
pilot must consult Chart Supplement for frequency. Absence of the white circle generally means no services or no published frequency. Sectional airport-symbol details: a small WHITE CIRCLE inside or near the symbol = a CTAF/UNICOM frequency exists; consult Chart Supplement for the actual frequency. Solid magenta/blue circles without the white inset typically have no published frequency. The Chart Users' Guide section on airport symbology is essential reading. Source: FAA Aeronautical Chart User's Guide, Airports section.
tower frequency is on 121.5.
121.5 is emergency, not normal CTAF.
the airport is a heliport.
Heliports use a different (H) symbol.
Why
pilot must consult Chart Supplement for frequency. Absence of the white circle generally means no services or no published frequency. Sectional airport-symbol details: a small WHITE CIRCLE inside or near the symbol = a CTAF/UNICOM frequency exists; consult Chart Supplement for the actual frequency. Solid magenta/blue circles without the white inset typically have no published frequency. The Chart Users' Guide section on airport symbology is essential reading. Source: FAA Aeronautical Chart User's Guide, Airports section.
FAA source: FAA Aeronautical Chart User's Guide, Airports sectionbrowse the reference library →
Original study question written for this course — representative of FAA knowledge-test topics, not an actual current FAA exam question.