Definition
The imaginary line running lengthwise down the exact middle of a runway, from threshold to threshold. It is marked on the runway surface by a series of long white stripes with regular gaps between them, and it serves as the primary visual reference pilots use to align the aircraft during takeoff, landing, and rollout.
Plain English
The line down the middle of the runway that pilots aim to keep the aircraft on during takeoff and landing.
Context Anchor
Seen in airport information, runway marking discussions, lighting descriptions, and NOTAMs about runway conditions or equipment.
Why Pilots Care
Staying on the runway centerline prevents excursions off the pavement and supports safe operations, especially on narrow or contaminated runways.
Intuition Check
Do not read centerline as just any painted line near the middle. In this context, it means the runway’s exact lengthwise middle reference line.
Example Sentence 1
After touchdown, he applied gentle rudder to track the runway centerline as the aircraft slowed.
Example Sentence 2
At night the centerline lights help the crew track the RCL during takeoff.