How does the fuel SOV normally close?

How does the fuel SOV normally close?

• A. Throttles to Shutoff or FIRE Push switch light
• B. Hydraulic pressure
• C. Manual lever
• D. Electric solenoid

Answer: (A)

The fuel shutoff valve is normally closed by commanding it through the engine control inputs: move the thrust levers to the shutoff position, or press the engine fire push switch. In either case, the control signal (through the fuel control or fire system) closes the valve to stop fuel flow to the engine. Hydraulic pressure or a manual lever aren’t the standard methods used for normal closure, and while some systems may use electrical or hydraulic actuation in certain designs, the typical and reliable way taught is throttle to shutoff or the fire push switch.

The fuel shutoff valve is normally closed by commanding it through the engine control inputs: move the thrust levers to the shutoff position, or press the engine fire push switch. In either case, the control signal (through the fuel control or fire system) closes the valve to stop fuel flow to the engine. Hydraulic pressure or a manual lever aren’t the standard methods used for normal closure, and while some systems may use electrical or hydraulic actuation in certain designs, the typical and reliable way taught is throttle to shutoff or the fire push switch.