Part 107 sectional chart question: 2026-10-18

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

Today's chart question for Sunday, Oct 18, 2026

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

Refer to the marked airport. What is the field elevation of MATTITUCK (21N)?

A. 30 ft AGL
B. 30 ft MSL
C. 2,200 ft MSL

Answer: B. In the airport data block the first number after the airport name/identifier line is the field elevation in feet above mean sea level: 30. The next number (22) is the length of the longest runway in hundreds of feet (2,200 ft), not an altitude. Elevation is always MSL; an airport's elevation above its own ground level would be zero, so 'AGL' makes no sense here. Knowing field elevation lets you convert MSL airspace altitudes (like a Class D ceiling) into height above the ground.

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