Definition
A configuration of high-intensity lights arranged in a specific pattern extending outward from the runway threshold along the extended centerline of the runway. Approach lighting systems provide visual guidance to pilots transitioning from instrument flight to visual flight for landing, helping them align with the runway and judge height and distance during the final segment of an approach.
Plain English
A line of bright lights on the ground leading up to the start of the runway. They help the pilot find the runway and line up with it when landing, especially at night or in poor visibility.
Context Anchor
Seen outside the cockpit during night landings, low-visibility approaches, and instrument approaches when the runway itself may not be fully visible yet.
Derivation
“Approach” comes from words meaning “to come nearer.” In aviation, it means the part of the flight when the aircraft is coming toward the runway to land. That matches these lights: they guide the aircraft as it comes nearer to the runway.
Why Pilots Care
They enable a safe transition from instrument flight to visual landing references at low altitude, reducing the chance of misalignment or controlled flight into terrain.
Intuition Check
Approach lights are not just any lights near a runway. They are a specific airport lighting system positioned to guide an aircraft toward the landing end of the runway.
Example Sentence 1
Breaking out of the clouds at minimums, the pilot saw the approach lights ahead and continued the descent to landing.
Example Sentence 2
The airport diagram shows that Runway 27 has a MALSR approach light system.