Jet engines have enough residual heat to ignite fuel up to how many minutes after shutdown?

Jet engines can retain residual heat following shutdown, which presents a significant fire hazard, particularly due to the potential for igniting fuel in the vicinity. The correct answer indicates that residual heat can remain sufficient to ignite fuel for up to 20 minutes after the engine has been turned off.

This timeframe is crucial for airport firefighters and emergency responders, as they need to be aware of the duration of potential fire risks when dealing with an aircraft after its engines are shut down. An understanding of this residual heat is vital for carrying out safe firefighting operations and ensuring that all personnel remain vigilant during the specified time period.

It's important to note that heat dissipation varies based on several factors, including engine type and ambient conditions, which is why familiarity with these timeframes is essential for effective emergency response protocols.