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In some aircraft, the shut-off function is a different valve located after the fuel selector valve. Typically, after the selector valve—situated at a low point in the fuel run—there is a gascolator — a fuel filter that can be opened on the ground and drained of fuel impurities denser than petroleum, mainly water and sediment.
Diagram of a typical gas turbine jet engine. Air is compressed by the compressor blades as it enters the engine, and it is mixed and burned with fuel in the combustion section. The hot exhaust gases provide forward thrust and turn the turbines which drive the compressor blades. 1. Intake 2. Low pressure compression 3. High pressure compression ...
14 Bypass Valve; 15 Aft Fuel Pump (Tank No. 1) 16 Forward Fuel Pump (Tank No. 1) 17 Tank No. 1 (Left) 18 Fuel Scavenge Shutoff Valve; 19; 20 APU Fuel Shutoff Valve; 21 APU; 22 Fuel Temperature Sendor; 23 Fuel Temperature Indicator; 24 Right Fuel Valve Closed Indicator Light; 25 Left Fuel Valve Closed Indicator Light; 26 Crossfeed Valve Open ...
The float is lifted upward by inertia, closing the fuel inlet valve as if the fuel bowl was full of fuel. Cutting off the fuel supply causes the fuel-air ratio to become greater than sixteen to one, which is then too lean for combustion to take place, stopping the engine. [10] [11] The inverse is also true when the aircraft is in inverted ...
A fuel control unit attempts to solve those problems by acting as an intermediary between the operator's controls and the fuel valve. The operator has a power lever which only controls the engine's potential, not the actual fuel flow. The fuel control unit acts as a computer to determine the amount of fuel needed to deliver the power requested ...
The float operates a valve which keeps the fuel level in the carburetor consistent despite varying demands by means of a linked float valve. As the fuel level increases, the valve closes slowing or stopping the flow into the bowl. However, since the float depends on gravity to function, it is ineffective when the aircraft is inverted.