FO restrictions are invoked when a runway is shorter than how many feet?

• A. 3500 ft
• B. 4500 ft
• C. 5000 ft
• D. 6000 ft

Answer: (B)

Runway length directly affects the safety margin for takeoff and landing. When the available pavement is shorter, flight operations implement FO restrictions to ensure there is enough room to safely accelerate, reach needed speeds, and stop or climb within the runway limits. The threshold used here is 4500 feet; if the runway is shorter than that, those restrictions kick in to enforce more conservative performance planning. This helps pilots manage factors like weight and configuration in a way that keeps operations safe on limited-length runways. The other numbers correspond to longer runways and do not trigger these specific restrictions.