FIELD: aircraft instrumentation engineering; check of fuel capacity of aircraft. SUBSTANCE: proposed system is used for determination of fuel mass in each tank and total fuel mass of aircraft by means of sensors indicating fuel level, temperature and characteristic parameters (heat conductivity). Level of fuel is measured in at least three different points not lying on one straight line. Volume of fuel is calculated in on-board computer by its level with geometric characteristics of fuel tanks taken into account. Grade of fuel or ratio of different grades is determined in on- board computer by characteristic parameter and temperature. Density of fuel is determined in fuel parameter driver included in on-board computer by grade of fuel or ratio of grades and temperature. Mass of fuel is determined in mass computer included in on-board computer by density and volume calculated in onboard computer. Total mass of fuel is found in summing-up unit. EFFECT: enhanced accuracy of determination of fuel mass at spread of temperatures and grades. 1 dwg
