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
Activation of the Standby System may be manual or automatic.
Manual activation may be accomplished by:

  • Positioning either Flight Control switch to STBY RUD.
  • Positioning the Alternate Flaps switch to ARM.
Automatic operation takes place under these conditions only:

  • Loss of System A or B and
  • TE flaps extended, and
  • airborne, or wheel speed greater than 60 knots, and
  • FLT CONTROL switch A or B is ON.
The low pressure
sensor sends a
signal to open the
PTU Control Valve.