What is a consequence of microbial contamination in fuel systems?

Microbial contamination in fuel systems leads to the growth of bacteria, fungi, and other microorganisms that can thrive in the presence of water and fuel. When these microbes proliferate, they create a variety of byproducts and sludge that can have detrimental effects on the fuel's quality.

One significant consequence of microbial growth is a decrease in the overall grade rating of the fuel. This can occur because the contamination can lead to the formation of acids, which can corrode fuel system components, and also produce particles that can block filters and injectors. Furthermore, the presence of these microorganisms can lead to a breakdown of the fuel over time, making it less effective and potentially harming the engine's performance.

Therefore, recognizing microbial contamination as a factor that contributes to a lower fuel grade is critical for maintaining the integrity and functionality of aircraft fuel systems. Keeping fuel systems free from microbial contamination is essential for ensuring both safety and performance in aviation.