How often should fuel samples be taken to ensure validity?

Taking fuel samples within 24 hours of the aircraft's initial launch is crucial for ensuring the quality and safety of the fuel being used in the aircraft. This timeframe allows for an assessment of the fuel's condition and ensures that any contaminants or issues that may have developed since the last check are identified before the aircraft is put into service. Fuel can degrade or become contaminated with water, particulates, or microbial growth, especially if it has been stored for extended periods. By adhering to this 24-hour guideline, personnel can effectively mitigate potential risks associated with fuel quality and maintain the aircraft's operational readiness and safety.

While taking samples every 12 hours or daily after each fueling could also be beneficial in certain contexts, the requirement to sample within 24 hours of launch strikes a balance between effective monitoring and practical operational procedures. This helps streamline the process while ensuring the integrity of the fuel does not go unchecked for too long, safeguarding the aircraft's performance and safety during flight.