In a three RVR system, how many sensors must be operative to meet minimums?

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Multiple Choice

In a three RVR system, how many sensors must be operative to meet minimums?

Explanation:
In a three-sensor RVR system, two sensors must be operative to meet minimums. Two working sensors provide enough independent measurements to derive a reliable Runway Visual Range value and allow cross-checking for accuracy. The sensors are placed at key points (touchdown, midpoint, and rollout), so with two functioning units you can still report a valid RVR and support published minimums. If only one sensor is working, the RVR cannot be determined with the required reliability, so minimums cannot be met. If all three are working, you’re well within requirements, but the essential minimum is two.

In a three-sensor RVR system, two sensors must be operative to meet minimums. Two working sensors provide enough independent measurements to derive a reliable Runway Visual Range value and allow cross-checking for accuracy. The sensors are placed at key points (touchdown, midpoint, and rollout), so with two functioning units you can still report a valid RVR and support published minimums. If only one sensor is working, the RVR cannot be determined with the required reliability, so minimums cannot be met. If all three are working, you’re well within requirements, but the essential minimum is two.

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