On a REIL three-setting system, Setting 2 must be used during the day when the visibility is ___.

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Multiple Choice

On a REIL three-setting system, Setting 2 must be used during the day when the visibility is ___.

Explanation:
REIL uses three daytime intensity settings to keep the runway end lights conspicuous under different visibility conditions. The middle setting is designed for moderate daytime visibility, specifically when visibility is between 2 and 5 miles. In this range, the lights are bright enough to be easily seen against daylight but not so bright as to cause glare in clearer conditions. Therefore, during the day, when visibility is 2 to 5 miles inclusive, Setting 2 is the appropriate choice. If visibility is lower, you would use a lower setting; if it’s higher, a higher setting.

REIL uses three daytime intensity settings to keep the runway end lights conspicuous under different visibility conditions. The middle setting is designed for moderate daytime visibility, specifically when visibility is between 2 and 5 miles. In this range, the lights are bright enough to be easily seen against daylight but not so bright as to cause glare in clearer conditions. Therefore, during the day, when visibility is 2 to 5 miles inclusive, Setting 2 is the appropriate choice. If visibility is lower, you would use a lower setting; if it’s higher, a higher setting.

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