Why are fuel samples important before the first flight?

Fuel samples are crucial prior to the first flight because they help ensure the quality of the fuel and detect any contamination that may be present. Contaminated fuel can lead to a variety of serious issues, such as engine failure or reduced performance, which can jeopardize the safety of the flight. By sampling and analyzing fuel before use, personnel can identify substances like water, dirt, or microbial growth that could affect engine operation. Thus, conducting these checks is an essential safety protocol that protects both the aircraft and its crew. Ensuring optimal fuel quality directly contributes to the reliability and safety of the flight, making this step indispensable.