Flight management system (FMS) fuel pages also display the position of the fuel valves graphically in diagrams called up on the flat screen monitors. Motor- and solenoid-operated valves use position annunciator lights to indicate valve position in addition to the switch position. Combined with labels and a directional handle, this makes it easy to identify by feel and by sight that the valve is in the desired position. Handoperated valves accomplish this through the use of detents into which a spring-loaded pin or similar protrusion locates when the valve is set in each position. Fuel valves can be manually operated, solenoid operated, or operated by electric motor.Ī feature of all aircraft fuel valves is a means for positively identifying the position of the valve at all times. Most simply open and close and are know by different names related to their location and function in the fuel system (e.g., shutoff valve, transfer valve, crossfeed valve). Large aircraft fuel systems have numerous valves. It incorporates the shutoff and selection features into a single valve. Other than sump drain valves, light aircraft fuel systems may include only one valve, the selector valve. They are used to shut off fuel flow or to route the fuel to a desired location. Fuel ValvesThere are many fuel valve uses in aircraft fuel systems.
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