Discussion
Multiple attitude and heading reference units are fitted to an aircraft so that
Answer: C
Correct answer: A failed unit can be excluded
Multiple units are fitted for fault tolerance. Two units allow a disagreement to be detected, and three allow the odd one out to be identified by median voting and excluded, so the system continues on the two that agree rather than reverting to no attitude reference at all.
The redundancy is not there to share power or to serve separate displays - a single unit can drive several - and averaging is the wrong operation, since a large error in one unit would drag the average with it. The purpose is to survive a failure, not to improve accuracy.
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