What does the standby hydraulic system power on a 737-800?

The standby hydraulic system on the Boeing 737-800 is designed to power essential hydraulic functions in the event of a primary hydraulic system failure. Specifically, this system provides hydraulic pressure to the primary flight controls, which are critical for the aircraft's maneuverability and safe operation. Additionally, the standby hydraulic system also powers the thrust reversers, which are vital for reducing landing distances and enhancing safety during landings.

By ensuring that both the primary flight controls and thrust reversers are operational, the standby hydraulic system plays a crucial role in maintaining control of the aircraft and improving performance in case of an emergency. It is important to note that the standby system does not power all hydraulic systems simultaneously nor does it solely focus on the landing gears, focusing instead on maintaining control and stopping capabilities when they are most needed.