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Some aircraft have maximum speeds for the deployment of speed brakes to…

  • A
    Prevent longitudinal pitch instability at high speeds caused by speed brake operation.
  • B
    Avoid the roll control from being compromised by turbulence from the speed brakes.
  • C
    Ensure that fuel economy is maximised by reducing drag at high speeds.
  • D
    Prevent damage to the speed brakes due to excessive aerodynamic forces.

Speed brakes are deflected in flight over the top of the wing to cause additional aerodynamic drag, in order to allow speed reduction during descent. Speed brakes are the same panels used as spoilers after landing, with lower deflection angles so as not to induce wing stall.

To avoid speed brakes being exposed to excessive aerodynamic forces and possibly being torn off in the airflow, limiting speeds are provided for their deployment.

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