What is the recommended time to wait after operation before obtaining a fuel sample?

The recommended time to wait for obtaining a fuel sample after operation is two hours. This duration allows for any residual fuel to settle and ensures that any contaminants that may have accumulated during operation can properly separate from the fuel. Waiting for this period is crucial because it enhances the accuracy of the fuel sample analysis, allowing maintenance personnel to assess the fuel quality effectively. Gathering the sample too soon may not provide a representative specimen of the fuel, potentially leading to misjudgments about its condition and safety for continued operations.