What is the "A/B AUTO EXT" button in the overhead panel of the Dassault Falcon 7X? I see it's in the Flight Control section but I don't know what is its purpose.

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(sorry for low quality image)

  • 2
    $\begingroup$ What happens when you press it? $\endgroup$
    – CrossRoads
    Aug 19, 2018 at 22:28
  • 1
    $\begingroup$ That cracked me up.... $\endgroup$
    – John K
    Aug 20, 2018 at 1:35

1 Answer 1


It's the arming switch for Air Brake Auto Extend on landing. The airplane has speed brakes (often called Flight Spoilers) the pilot can operate manually for glide path control. This mode extends them automatically as lift dumpers after touchdown.

  • $\begingroup$ I see! It's an unusual position on the overheal panel (and an unusual name). Thank you. $\endgroup$
    – ocirocir
    Aug 20, 2018 at 8:35

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