What does a steady green light signal mean to an aircraft on the surface? In flight?
Answer
On the surface: cleared for takeoff. In flight: cleared to land.
14 CFR § 91.125
Read the full regulation — 14 CFR § 91.125
Part 91 Section 91.125 § 91.125 ATC light signals. ATC light signals have the meaning shown in the following table: Color and type of signal | Meaning with respect to aircraft on the surface | Meaning with respect to aircraft in flight --------------------------+-------------------------------------------------+-------------------------------------------------------------------- Steady green | Cleared for takeoff | Cleared to land. Flashing green | Cleared to taxi | Return for landing (to be followed by steady green at proper time). Steady red | Stop | Give way to other aircraft and continue circling. Flashing red | Taxi clear of runway in use | Airport unsafe—do not land. Flashing white | Return to starting point on airport | Not applicable. Alternating red and green | Exercise extreme caution | Exercise extreme caution.
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