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What happens if one of the autopilots in a fail passive autoland system fails?
  • A

    The airplane will continue flying normally, but the autoland could not be initiated.

  • B
    Landing completed automatically.
  • C
    The pilots should prepare for an out of trim condition.
  • D
    Nothing will change.
In the event of a failure of one of the autopilots, or if they deliver different control command outputs, the automatic landing system can behave in either of two ways: fail passive or fail operational.
  • Fail passive - The automatic landing system is fed by only two fail-safe autopilots comparing their computations, therefore it cannot determine which one of the units is delivering the correct steering commands. In the event of a failure, there is no significant out-of-trim condition or deviation of flight path or attitude, but the landing is not completed automatically.
  • Fail operational - The automatic landing system consists of three independent autopilot channels per controlled axis, it is capable of determining the failed component and excluding it from the computation. In the event of a failure, the approach, flare, and landing can be completed by the remaining part of the automatic system.

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