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Throttle Quadrant

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Engine Control Panel

Thrust Control Component Description

Thrust Levers

  • The thrust levers and reverse thrust levers are mechanically interlocked. The thrust levers can only be moved when the reverse levers are fully stowed.
  • Idle Detent (0): Idle thrust position.
  • Forward: Moves the thrust levers forward to increase engine N1 and thrust.
  • Retard: Pulls the thrust levers back to decrease engine N1 and thrust.

TOGA Button

  • This is a momentary pushbutton.
  • Pressing either button activates Takeoff / Go-Around (TOGA) thrust.

Reverse Thrust Levers

  • Reverse thrust levers can be raised only when the thrust levers are in idle.
  • Lift Up: Deploys reverse thrust. If the electronic lock is released, the reverse levers can move to the full position, increasing reverse thrust to maximum.
  • Pull Down: Reduces reverse thrust. Once fully stowed, reverse thrust is disengaged.

A/T Disconnect Button (A/T DISC)

  • Pressing either momentary button disconnects the Autothrottle (A/T).

Left (Right) Fuel Control Switches

  • The switch must be lifted before operation to prevent accidental activation.
  • ON:
    • Opens the engine LPSOV (Low-Pressure Shutoff Valve) and HPSOV (High-Pressure Shutoff Valve), enabling fuel supply.
  • OFF:
    • Closes the LPSOV and HPSOV, cutting off the fuel supply.

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