What is the primary hazard associated with aircraft fuel spills?

The primary hazard associated with aircraft fuel spills is the risk of ignition and potential fire outbreak. When fuel is spilled, it creates a highly flammable environment, particularly in the presence of ignition sources such as sparks, open flames, or even electrical equipment. The volatility of aviation fuels means that they can easily vaporize and form flammable mixtures in the air. This presents a significant danger, as even a small source of ignition could trigger a fire or explosion.

While environmental contamination and vapor release are important considerations, they are secondary to the immediate threat posed by the potential for fire. Aircraft structural damage can certainly occur as a result of a fire, but the initial hazard and the focus during an emergency response would be on preventing ignition and controlling any spills to avoid fire outbreaks. Thus, the primary concern with aircraft fuel spills is indeed the high risk of ignition leading to fire.