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The micro-controller calculates the level of each wing. After reading the aircraft type thanks to the coding, the micro-controller selects the volume which corresponds to the measured level, in the aircraft data table. The measure is successively made on each wing, the average value is converted by a numerical filter. During the level calculation, the micro-controller checks if the frequency of each sensor is right. - full tanks : Frequency = 6000 HZ -± 200 - empty tanks : Frequency = 8200 HZ ± 200 If a reading is wrong, the micro-controller informs the user about the failure by a pointer pulse on the galvanometer corresponding to the concerned wing. - exernal sensor failure : the pointer hunts around the value read by the internal sensor. - internal sensor failure : the pointer hunts around zero value. After the conversion by a dual digital-analogical converter, the voltages which are proportional to the volumes of the wings go through an adapter stage allowing the independent setting of the Min and Max of each wing thanks to the potentiometers accessible with the closed boxes. Each volume is displayed on an indicator. C. Tank indicators The tank indicators are fitted into engine monitoring cluster and display the remaining fuel quantities. AHAC Validity S/N 969,1185,1214,1478,1506 - 1508,1513 - 9999 28-40-00 (DM)Page 2 SEP 04 D. Fuel pressure switch The fuel pressure switch allows to transmit the correct operation of the electric fuel pump to the pilot. It controls the illumination of the pump indicator light on the advisory panel when the pressure supplied by electric fuel pump is : - "JAEGER" pressure switch P z 11.6 ± 0.8 PSI (0.8 ± 0.05 bar) - "HOBBS" pressure switch P z 10 ± 2 PSI (0.7 ± 0.14 bar) It is located at the engine pump intake. E. Microswitch of selector valve indicator light The microswitch of selector valve indicator light allows to transmit the open or closed position of the selector valve to the pilot. It controls the extinguishing of the selector valve indicator light on the advisory panel when it is on the L.H. or R.H. position. It is located on the selector valve control. F. Low level detector The low level detector (one for each tank) transmits to the pilot the minimum quantity of usable fuel that remains in any of the two tanks. It is located on the root pressure bulkhead of each tank. Option Pre-MOD. 151. Standard Post-MOD. 151 It controls the illumination of a red indicator light on the advisory panel when the usable fuel quantity that remains in any of the two tanks is approximately 6.6 US Gal (25 liters). Post-MOD. 171 It controls the illumination of L.H. or R.H. red indicator light on the L.H. advisory panel when the usable fuel quantity that remains in the corresponding tank is approximately 6.6 US Gal (25 liters). 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 28 FUEL TB20飞机维护手册 燃油(38) |
