Definition
A numerical value from 0 to 6 assigned to each third of a runway to describe how much braking action a pilot can expect on that surface. The code is determined by airport operators using the Runway Condition Assessment Matrix (RCAM), which considers contaminants such as water, snow, slush, ice, and compacted snow, along with temperature and depth. A code of 6 indicates a dry runway with normal braking; a code of 0 indicates a runway where braking action is nil and operations are not recommended.
Plain English
A single number from 0 to 6 that tells the pilot how slippery the runway is. Higher means better grip; lower means worse. The runway is split into three parts, and each part gets its own number.
Context Anchor
Pilots see Runway Condition Codes in runway condition reports, airport field condition notices, and performance planning for takeoff or landing on wet, snowy, icy, or otherwise contaminated runways.
Derivation
“Code” comes from an old word meaning a system of written signs or rules. Here it helps because the runway condition is reduced to a simple number that carries a specific meaning.
Why Pilots Care
It directly affects the runway length required for safe takeoff and landing and can determine whether a flight can proceed or must divert.
Grounding Statement
A dry runway is normally reported as 6, while a runway covered with very slippery ice may be reported as 0.
Intuition Check
Do not read this as a general opinion that the runway is “good” or “bad.” It is a specific 0-to-6 runway grip code, usually reported separately for the first, middle, and last third of the runway.
Example Sentence 1
ATIS reported runway condition codes of 5/4/5, so the crew checked their landing performance for a slightly degraded surface in the middle third.
Example Sentence 2
With a Runway Condition Code of 2 the crew increased the calculated landing distance by thirty percent.