Part 107 sectional chart question: 2026-10-19

Daily sectional drill archive. Answer it, then read the worked explanation.

Today's chart question for Monday, Oct 19, 2026

FAA sectional chart excerpt for this question — Sectional: Los Angeles, edition effective Sep 3, 2026 (next edition Oct 29, 2026). Source: FAA (public domain).

Refer to the marked airport. If the control tower at GILLESPIE FLD (SEE) is not in operation, which frequency should be used as the CTAF to monitor airport traffic?

A. 120.7
B. 121.7
C. 125.45

Answer: A. The airport data block shows the tower frequency after CT: CT - 120.7, followed by a star and a magenta C. The star means the tower is part-time (hours are listed in the Chart Supplement: 0700-2100 local). The magenta C next to it means the tower frequency becomes the CTAF when the tower is closed, so the answer is 120.7. The other choices are frequencies printed nearby for other services (ATIS, ground, UNICOM). When the tower closes, Class D airspace usually reverts to Class E or Class G; check the Chart Supplement.

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