Autobrake

AUTOBRAKE SELECTOR KNOB (ROTARY ACTION)

• RTO: Selects Rejected Takeoff deceleration rate. This mode is equivalent to maximum manual braking.

• OFF: Autobrake is deactivated.

• LO: Selects the low deceleration rate.

• MED: Selects the medium deceleration rate.

• HI: Selects the high deceleration rate.

AUTOBRAKE OPERATION

• Modulates hydraulic pressure to the brakes in order to provide a constant deceleration rate corresponding to the level selected.

• If reverse thrust is actuated, the autobrake system will modulate the brake pressure to maintain the deceleration rate constant to the mode selected.

• Anti skid, touchdown and locked wheel protections are provided during autobrake operation.

• Autobrakes will be disengaged when brake pedal pressure is applied, or the thrust lever is above idle.

• Rejected Takeoff autobrakes will engage when:

  • Thrust levers IDLE or REV.

  • Wheelspeed above 60kts.

  • Brake pedals not pressed.

• Ways to disarm the autobrakes:

  • Selector switch set to OFF.

  • Pedal braking is applied.

  • Brake control system failure is detected.

  • Either thrust lever is advanced beyond IDLE during autobrake application.