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# Fuel quantity indicator

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flight instrument in aircraft overview

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### Fuel quantity indicator

1. 1. FUEL GUAGES ON AIRCRAFTS
2. 2. Do not depend solely on the accuracy of the fuel quantity gauges. Always visually check the fuel level in each tank during the preflight inspection, and then compare it with the corresponding fuel quantity indication. Most small aircraft have two fuel tanks, one in each wing. This gauge indicates the level of fuel in each tank. Unlike an automobile, these gauges are used only as a cross-check. Pilots are trained to calculate their exact fuel consumption before a flight and leave a reserve of at least 30 minutes for daytime and 45 minutes at night.
3. 3. Types OF Fuel Gauges •Analogue Fuel Gauges •Digital Sunburst Fuel Gauges Simmonds 4 Tank
4. 4. Fuel Gauge Accuracy The total tolerance for the FQIS system is based on a full tank. For example, if the fuel tank maximum capacity is 10,000 KG, then the tolerance of the gauging is 0.03 (airplane with analog indicators) * 10000 = 300 KG. The system tolerance is then +/- 300 KG at any fuel level within the tank. The accuracy of the fuel flow transmitter is a function of the fuel flow
5. 5. The 737 fuel quantity indication system has the following accuracy tolerances • 737-100/-200: FQIS accuracy: +/- 3.0% • 737-300/-400/-500, FQIS accuracy with digital indicators: +/- 2.5 % FQIS accuracy with analog indicators: +/- 3.0%
6. 6. NG’S FUEL GUAGES DU Fuel Gauges -NG's Low fuel quantity indication illuminates below either 907 or 453kg - NG's