What is one way to close the HYD SOV?

• A. Press the applicable HYD SOV Switch Light
• B. ENG FIRE PUSH switchlight
• C. Open the HYD SOV manual switch
• D. Cycle the engine start switch

Answer: (A)

Closing the HYD SOV is done by activating its control: press the HYD SOV switch light for the valve you want to close. This electrical command drives the hydraulic shutoff valve to the closed position, isolating that hydraulic circuit and stopping fluid flow. The switch light helps confirm that the command has been issued and the valve is engaged.

The other options don’t accomplish this isolation. The engine fire push switch light serves a different system entirely, not to shut off hydraulic flow. Opening the HYD SOV manual switch would typically bypass or override the electrical command and might open the valve or defeat the automatic control, which isn’t what you want when you need to close it. Cycling the engine start switch also doesn’t close the hydraulic shutoff valve.