Definition
The lengthwise upward or downward gradient of a runway, expressed as the percentage of rise or fall over the runway's length. A runway that climbs or descends along its length is said to have an upslope or downslope.
Plain English
How much a runway tilts uphill or downhill from one end to the other.
Context Anchor
Pilots encounter runway slope when planning a landing, reviewing airport information, and judging the runway visually during approach.
Derivation
Runway means the prepared surface used for takeoff and landing. Slope comes from an old word meaning to slant. Together, runway slope means the slant of the landing surface from one end to the other.
Why Pilots Care
A sloped runway alters visual perception of the approach path and can cause pilots to land short, float, or overrun the intended touchdown point.
Analogy
It is like looking at a driveway from the street: if the driveway climbs uphill, its angle can change how steep or shallow the path appears.
Grounding Statement
On final approach, the runway’s tilt can change what your eyes think is a normal landing path.
Intuition Check
Do not assume runway slope is just a construction detail. In landing, it can change how high or low the airplane appears to be.
Example Sentence 1
The Chart Supplement showed a 1.8 percent runway slope, so the pilot expected the approach to look flatter than usual.
Example Sentence 2
A downhill runway slope can make the threshold look farther away, leading to a high flare if not corrected.