Section 1065.320 - Fuel-flow calibration(a) Calibrate fuel-flow meters upon initial installation. Follow the instrument manufacturer's instructions and use good engineering judgment to repeat the calibration.(c) You may remove system components for off-site calibration. When installing a flow meter with an off-site calibration, we recommend that you consider the effects of the tubing configuration upstream and downstream of the flow meter. We recommend specifying calibration reference quantities that are NIST-traceable within ±0.5% uncertainty. 70 FR 40516 , July 13, 2005, as amended at 86 FR 34541 , June 29, 2021; 88 FR 4674 , Jan. 24. 2023