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A two bit error corrupts an ARINC 429 word in flight. The receiver accepts the word as valid and uses the corrupted value.

Why was the error not detected?

  • A.The bus was running at the wrong speed
  • B.The sign status matrix was ignored
  • C.Parity misses an even number of errors
  • D.The label was corrupted first

Answer: C

Two errors leave the parity unchanged, so the word passes every check the standard provides. That blind spot is precisely why later buses carry checksums or cyclic redundancy checks instead. A few extra bits close the gap.

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