In the context of a Daily inspection, when are fuel samples considered valid?

In the context of a Daily inspection, fuel samples are considered valid for up to 72 hours. This timeframe is established to ensure that the collected samples are representative of the fuel in the aircraft and have not been compromised by contamination or degradation over time.

Fuel quality is critical for the safe operation of aircraft, and the validity period allows mechanics and pilots to assess the fuel prior to its use. If the samples are older than 72 hours, there is a risk that they may not accurately reflect the current condition of the fuel in the tank, which could lead to potential operational problems. Therefore, anything beyond this timeframe necessitates the collection of new fuel samples to ensure safety standards are maintained. This practice is aligned with safety protocols and regulatory requirements in aviation that prioritize maintaining the integrity of the fuel used in aircraft operations.