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Hydraulic Systems
The three hydraulic systems are green, blue, and yellow. Each system has a fire shut off valve between the reservoir and engine driven pumps. Each system delivers a constant 3000 PSI.
The 3 systems are totally independent and isolated. Engine 1 is used to pressurise the hydraulic reservoirs, although any other source on the cross bleed duct can also be used (for example, engines off when on the ground).
Failures
| HYD G(B)(Y) ENG 1(2) PUMP LO PR | - there may be a pressure drop if remaining pumps cannot generate sufficient pressure |
| HYD G(B)(Y) RSVR LO LVL | - the hydraulic system pumps will need to be switched off - a G(B)(Y) SYS LO PR caution will appear after the system depressurises - ECAM pages for secondary affected systems are automatically displayed - < 8L (green system) / < 5L (blue & yellow systems) |
| HYD G(B)(Y) RSVR OVHT | - the hydraulic system pumps will need to be switched off - a G(B)(Y) SYS LO PR caution will appear after the system depressurises - ECAM pages for secondary affected systems are automatically displayed |
| HYD G(B)(Y) SYS LEAK | - causes the fire shutoff valves to close automatically once a low level is detected (green system only) |
A double failure, for example HYD B+Y SYS LO PR, could cause an autopilot disconnect and a LAND ASAP message.