In a four RVR system, how many sensors must be operative?

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Multiple Choice

In a four RVR system, how many sensors must be operative?

Explanation:
Redundancy in an RVR system is built so that one failure doesn’t stop reporting. In a four-sensor setup, you need at least three sensors to be operative. With three working sensors, you still have enough coverage across the runway to produce a credible RVR value by cross-checking readings and maintaining data integrity. If only two sensors are working, the coverage and reliability aren’t sufficient for valid reporting, so the system can’t be considered serviceable for RVR. Having all four functioning is ideal, but the minimum required is three.

Redundancy in an RVR system is built so that one failure doesn’t stop reporting. In a four-sensor setup, you need at least three sensors to be operative. With three working sensors, you still have enough coverage across the runway to produce a credible RVR value by cross-checking readings and maintaining data integrity. If only two sensors are working, the coverage and reliability aren’t sufficient for valid reporting, so the system can’t be considered serviceable for RVR. Having all four functioning is ideal, but the minimum required is three.

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