What is the maximum runway slope allowed?

• A. +/-2%
• B. +/-1%
• C. +/-3%
• D. 0%

Answer: (A)

The maximum runway slope allowed is two percent in either direction. Runway grade directly affects takeoff and landing performance because the gravity component along the runway changes how quickly you accelerate or decelerate, which in turn shifts the required landing distance and the effectiveness of braking. The aircraft’s performance data are certified for runways up to a 2% grade, so steeper slopes can push you beyond the proven margins and safety envelopes. A slope of zero is just a special case within the allowed range, while slopes of +/-3% or more fall outside the certified operating limitations.