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Hydraulic System 1
- Center autopilot
- Alternate Brakes
- Nose/body gear steering and actuation
- Left outboard elevator
- Inboard trailing edge flaps
- Redundant power to primary flight controls
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Hydraulic System 2
- Right autopilot
- Backup for alternate brakes
- Spoilers (2,3,10,11)
- Lower yaw damper
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Hydraulic System 3
- Left autopilot
- Spoilers (1,4,9,12)
- Upper yaw damper
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Hydraulic System 4
- Normal brakes
- Parking brake accumulator
- Wing gear actuation
- Right outboard elevator
- Outboard trailing edge flaps
- Spoilers (5,6,7,8)
- Redundant power to primary flight controls
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