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An aircraft departs for a VFR flight. The route involves a descent into mountainous terrain.
En-route an instrument fails, which makes it more difficult to fly without visual reference, and the weather deteriorates to IMC.
The pilot continues to attempt to fly under VFR but crashes into the mountains.

What type of error best characterizes this accident scenario?
  • A
    Isolated error.
  • B
    Lapse.
  • C
    Design-induced error.
  • D
    Error chain.
Accidents in aviation are usually not the result of one single catastrophic error. Instead, it requires several individual errors, both latent and active, for an accident to occur. The undesired outcome could have been prevented if any of these errors had either not happened or had been detected and corrected. A sequence of errors leading to an accident or other undesired outcome is referred to as an error chain.

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