What is the primary hazard of a fuel spill on an airport runway?

The primary hazard of a fuel spill on an airport runway is a slippery surface. When fuel is spilled, it creates a slick layer on the pavement, significantly reducing traction for both aircraft and ground vehicles. This can lead to loss of control during landing or takeoff, increasing the risk of accidents. Pilots and ground crew must be aware of this hazard to take appropriate safety measures.

In contrast, while increased aircraft weight may be a concern in other contexts, it does not directly relate to the immediate dangers posed by a fuel spill. Noise pollution is not a relevant factor in the scenario of a fuel spill, as the concerns are primarily safety-related. Increased visibility is also not applicable; a fuel spill can actually decrease visibility if it contributes to smoke or vaporization, leading to further hazards during flight operations. The slippery surface poses a direct and immediate threat, making it the most significant hazard in this context.