Discussion
Assertion (A): A receiver must examine the sign status matrix before using an ARINC 429 value.
Reason (R): A word may arrive intact yet be flagged as no computed data or failure warning.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second explains why the check is necessary. Parity confirms only that the bits survived transmission; it says nothing about whether the value they encode means anything.
The sign status matrix is how a source disclaims its own output - an air data computer that has lost a probe keeps transmitting but flags the word as no computed data. A receiver reading the data field without the SSM will act on a value the transmitter has already declared unreliable, which is a real and recurring integration fault.
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