𝐀𝐢𝐫𝐜𝐫𝐚𝐟𝐭 𝐇𝐲𝐝𝐫𝐚𝐮𝐥𝐢𝐜 𝐒𝐲𝐬𝐭𝐞𝐦

🛩️All aircraft hydraulic systems have one or more power-driven pumps and may have a hand pump as an additional unit when the engine-driven pump is inoperative.

🛩️Power-driven pumps are the primary source of energy and may be either engine driven, electric motor driven, or air driven.

🛩️As a general rule, electrical motor pumps are installed for use in emergencies or during ground operations.

🛩️Some aircraft can deploy a ram air turbine (RAT) to generate hydraulic power.

🛩️Double-action hand pumps produce fluid flow and pressure on each stroke of the handle.

🛩️The double-action hand pump consists essentially of a housing that has a cylinder bore and two ports, a piston, two spring-loaded check valves, and an operating handle.

🛩️An O-ring on the piston seals against leakage between the two chambers of the piston cylinder bore.

🛩️An O-ring in a groove in the end of the pump housing seals against leakage between the piston rod and housing.

🛩️When the piston is moved to the right, the pressure in the chamber left of the piston is lowered.

🛩️The inlet port ball check valve opens and hydraulic fluid is drawn into the chamber.

🛩️At the same time, the rightward movement of the piston forces the piston ball check valve against its seat.

🛩️Fluid in the chamber to the right of the piston is forced out of the outlet port into the hydraulic system.

🛩️When the piston is moved to the left, the inlet port ball check valve seats.

🛩️Pressure in the chamber left of the piston rises, forcing the piston ball check valve off of its seat.

Source: aircraftsystemstech.com

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