![]() During cruise, the tolerance is less than 0.5%. At engine idle, the system tolerance can be 12%. The accuracy tolerance of the fuel flow transmitter is a function of the fuel flow. ![]() The system tolerance is then +/- 200 KG at any fuel level within the tank. For example, if the fuel tank maximum capacity is 10,000 KG, then the tolerance of the gauging is 0.02 (airplane without a densitometer) * 10000 = 200 KG. The total tolerance for the FQIS system is based on a full tank. The fuel flow indication is integrated over time to calculate the fuel used for each engine.ħ37-600/-700/-800/-900 with densitometer: During cruise, the tolerance is less than 1.5%. The accuracy of the fuel flow transmitter is a function of the fuel flow. The system tolerance is then +/- 300 KG at any fuel level within the 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 737 fuel quantity indication system has the following accuracy tolerances:įQIS accuracy with digital indicators: +/- 2.5 %įQIS accuracy with analog indicators: +/- 3.0% NG: The engine spar valves and APU are normally powered by the hot battery bus but have a dedicated battery to ensure that there is always power to shut off the fuel in an emergency.Īnalogue Fuel Gauges -1/200's and some older -300'sĭigital Sunburst Fuel Gauges - Simmonds 4 Tank - 3/4/500'sĭigital Sunburst Fuel Gauges - Smiths - 3/4/500's They were solenoid held and automatically moved back to OFF after one minute. The 1/200's had heater switches these used bleed air to heat the fuel and de-ice the fuel filter. The FILTER BYPASS lights were FILTER ICING on the 1/200. ![]() The -1/200 panel also has blue VALVE OPEN lights similar to that on the crossfeed valve. The NG's have separate ENG VALVE CLOSED & SPAR VALVE CLOSED lights in place of FUEL VALVE CLOSED. The fuel panels for the various series have not changed much over the years. The AFM limits are higher, but not normally achievable with standard SG's. The maximum declarable fuel capacity for tech log, nav log, etc is 16,200kgs for 3-Tank Classics, 20,800kgs for NG's and up to 37,712kgs for BBJ's depending upon how many tanks the customer has specified (max 12). ![]()
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