What are the consequences of using the improper type of fuel?

Using the improper type of fuel can lead to significant engine damage and safety risks. Each aircraft engine is designed to operate with specific fuel types that have particular properties, including octane ratings, combustion characteristics, and thermal stability. When an inappropriate fuel is used, it may not combust effectively, which can lead to incomplete combustion, increased deposits, and knocking or detonation.

This improper combustion can cause overheating, resulting in potential damage to engine components such as pistons, valves, and fuel injectors. Additionally, using the wrong fuel can also affect the engine's lubrication system, leading to accelerated wear and possible engine failure. Overall, the integrity of the aircraft's fuel system and engine performance is compromised, posing a serious safety threat during flight.

In contrast, the other options either minimize the impact of using improper fuel or suggest a beneficial outcome, which does not reflect the reality of fuel system dynamics and could mislead users about the critical importance of fuel compatibility.