Hydraulic System SGR
System A Using Units

  • Ailerons
  • Rudder
  • Elevator and Elevator Feel
  • Flight Spoilers
(Two on each wing)
  • Alternate Brakes
  • Number 1 Thrust Reverser
  • Autopilot A
  • Normal Nosewheel Steering
  • Landing Gear
  • Power Transfer Unit (PTU)
System B Using Units

  • Ailerons
  • Rudder
  • Elevator and Elevator Feel
  • Flight Spoilers
(Two on each wing)
  • Leading Edge Flaps and Slats
  • Normal Brakes
  • Number 2 Thrust Reverser
  • Autopilot B
  • Alternate Nosewheel Steering
  • Landing Gear Transfer Unit
  • Autoslats
  • Yaw Damper
  • Trailing Edge Flaps
The low pressure
sensor sends a
signal to open the
PTU Control Valve.
Remember that either A or B hydraulic system can power all primary flight controls with no decrease in airplane controllability.
The Standby System has been manually or automatically activated. The standby pump provides pressure and standby
hydraulic fluid pressure operates the Standby Yaw Damper, Standby Rudder PCU (Power Control Unit), the Number 2
Thrust Reverser and acts as a backup to Number 1 Thrust Reverser and the Rudder.