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Module 13. Aircraft aerodynamics, structures and systems

A triplex system looses one channel, the system is now,

  • fail redundant
  • fail operational
  • fail passive

Explanation

Losing one channel of a triplex system leaves two channels, which can detect a further disagreement and disconnect safely without a hazardous out-of-trim condition. That two-channel state is fail passive; it can no longer continue controlling through a second fault, so it is not fail operational.

Jordi asking:

shouldnt this be fail operational? it still has 2 channels

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