Aviation Dictionary

Approach lighting system (ALS)

Provides lights that will penetrate the atmosphere far enough from touchdown to give directional, distance, and glidepath information for safe transition from instrument to visual flight.

Dictionary Term

Approach lighting system (ALS)

Definition

Provides lights that will penetrate the atmosphere far enough from touchdown to give directional, distance, and glidepath information for safe transition from instrument to visual flight.

References

Pilot's Handbook of Aeronautical Knowledge · Federal Aviation Administration · 2023