Definition
Large numerals painted near the threshold of each runway end that identify the runway by its magnetic heading rounded to the nearest ten degrees, with the trailing zero dropped. A runway aligned to a magnetic heading of 273 degrees is marked as 27; the opposite end, aligned 180 degrees the other way, is marked 09.
Plain English
The big numbers painted on each end of a runway. They tell you which compass direction the runway points, using the first two digits of that heading.
Context Anchor
Seen on runway pavement, airport diagrams, takeoff briefings, taxi instructions, and radio calls.
Derivation
Runway refers to the surface an aircraft runs along for takeoff and landing. Numbers refers to the directional markers taken from magnetic compass headings and simplified for easy reading.
Why Pilots Care
Correct runway numbers ensure the aircraft is aligned with the intended surface, wind, and traffic pattern, preventing runway incursions and orientation errors.
Intuition Check
Runway numbers are not street addresses or random airport labels. They are direction labels based on the runway’s magnetic direction.
Example Sentence 1
Cleared for takeoff, the pilot checked the heading indicator against the runway numbers to confirm alignment with Runway 36.
Example Sentence 2
After landing on runway three six, the crew taxied to the opposite end where the numbers read one eight.