Aviation Technical English for aircraft maintenance engineers (Авиационный технический английский язык для студентов-авитехников)

71 given from the engine components to be lubricated. This gives a rise in system pressure. The actual oil pressure obtained will depend on the speed of the pump, the temperature of the oil, and the resistance offered by the components. The capacity of the pump must be such that it will supply a minimum oil pressure under its most adverse running conditions of low turning speed and high inlet oil temperature. As a consequence of this, under normal running conditions the increased flow would tend to cause a dangerously high oil pressure. Very high pressures are prevented by a ‘Pressure Relief Valve’ (P.R.V.) across the inlet and outlet connections which limits maximum pressure in the system. When the pressure reaches a predetermined figure, the valve opens and sufficient oil is returned to the inlet side of the pump to limit the maximum oil pressure. In operation the engine will have range of operating pressure related to engine speed from idle to maximum RPM. *https://www.aircraftspruce.com/catalog/pdf/13-08714.pdf (05.10.2018). COMPONENTS OFAN AIRCRAFT FUEL SYSTEM Fuel tanks: fuel tanks as the name suggests are mainly used to store fuel and manage fuel flow. In an aircraft there are two kinds of fuel tanks – one for storage and other to feed the engine. Fuel-lines and fittings: fuel line must be installed and supported to prevent excessive vibration and to withstand loads due to fuel pressure and accelerated flight conditions. They must be flexible and should be able to resist high temperatures. Fuel valves: Selector valves are installed in the fuel system to provide a means for shutting off the fuel flow, for tank and engine selection, for cross-feed, and for fuel transfer. Fuel pumps: fuel pump is also used to transfer fuel from one tank to another, to supply fuel under pressure for priming when starting the engine, and, as an emergency unit, to supply fuel to the carburetor in case the engine driven pump fails. Fuel pump is always turned on during takeoffs and landings to ensure a positive supply of fuel.