Operate the Approach Light System (ALS) between sunrise and sunset when the prevailing visibility is 5 miles or less, or when the ceiling is less than ___ feet.

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Multiple Choice

Operate the Approach Light System (ALS) between sunrise and sunset when the prevailing visibility is 5 miles or less, or when the ceiling is less than ___ feet.

Explanation:
The essential point is when the Approach Light System must be turned on during daylight. If visibility is 5 miles or less or the ceiling drops below 1000 feet, the ALS should be operated to help pilots locate the approach path and runway by providing additional visual cues in marginal conditions. The 1000-foot ceiling is the threshold used in this rule; when the ceiling is 1000 feet or higher, the requirement doesn’t apply. The other numbers represent higher ceilings and aren’t the trigger for daylight ALS operation.

The essential point is when the Approach Light System must be turned on during daylight. If visibility is 5 miles or less or the ceiling drops below 1000 feet, the ALS should be operated to help pilots locate the approach path and runway by providing additional visual cues in marginal conditions. The 1000-foot ceiling is the threshold used in this rule; when the ceiling is 1000 feet or higher, the requirement doesn’t apply. The other numbers represent higher ceilings and aren’t the trigger for daylight ALS operation.

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