How long are aircraft fuel samples considered valid?

Aircraft fuel samples are considered valid for a period of 24 hours. This time frame ensures that the samples reflect the condition of the fuel, taking into account potential changes due to factors such as temperature variations, contamination, or sediment settling. Fuel quality can degrade over time due to the presence of water or microbial growth, which can develop if samples are stored for extended periods. Thus, the 24-hour validity is designed to ensure that the fuel meets safety and operational standards at the time of use, guaranteeing that the aircraft operates efficiently and safely. This time limit is crucial for maintaining strict safety protocols within aviation and ensuring that any anomalies in fuel quality can be addressed promptly.