What is one method to close the hydraulic shutoff valves?

The method to close the hydraulic shutoff valves involves pressing either the left or right hydraulic valve close switch. This action directly engages the hydraulic system's control to shut off the flow of hydraulic fluid, effectively isolating the associated systems and ensuring safe operation during maintenance or emergency situations.

Using the hydraulic press switch primarily pertains to activating or deactivating hydraulic systems rather than specifically closing the shutoff valves. Turning the hydraulic shutoff lever is typically a more manual method that might not be applicable in all aircraft systems or might represent a different procedure entirely. The engine ignition switch is unrelated to hydraulic systems, as it is used primarily for starting the engines and does not interact with hydraulic valve functions. Therefore, the hydraulic valve close switch is the designated and efficient method for closing the hydraulic shutoff valves.