Which factors determine the best evacuation course?

• A. Whether engines are still running
• B. Location of perceived threat
• C. Environment outside aircraft
• D. Number of passengers onboard

Answer: (A)

The most important factor in choosing the best evacuation path is whether engines are still running. When engines are operating, they produce jet blast, heat, and potential hazards from intake areas and nearby fuel fires. These hazards create clear “dead zones” around certain exits and can make some routes unsafe due to being in the direct jet stream or in the path of hot exhaust. So, the safest evacuation plan prioritizes exits and routes that keep people out of those hazardous zones and away from the engine’s influence.

Other considerations like where you think a threat is located, what the outside environment is like, or how many passengers are onboard matter for how you manage the evacuation (timing, where to direct people, how many exits you’ll need, etc.), but they do not dictate the safety of the route as directly as engine status does. If the engines were shut down, some routes that are risky with engines running might become acceptable; with engines running, those routes are typically avoided.