For transmission line supports, the high-intensity white flashing lights are mounted at the top, bottom, and middle, and shall flash at what rate?

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Multiple Choice

For transmission line supports, the high-intensity white flashing lights are mounted at the top, bottom, and middle, and shall flash at what rate?

High-intensity white flashing lights on transmission line supports are placed at multiple vertical positions to ensure the structure is visible from different angles and flight levels. When all three lights—the top, bottom, and middle—flash together at 60 times per minute, they create a clear, rhythmic cue that’s easy for pilots to detect and interpret. About one flash per second provides strong visibility in both day and night conditions and helps convey the tower’s full vertical extent, reducing the chance of misjudging its height or location. If lights were only at a single position or flashed more slowly, the structure would be less conspicuous and harder to spot from certain viewpoints or distances.

High-intensity white flashing lights on transmission line supports are placed at multiple vertical positions to ensure the structure is visible from different angles and flight levels. When all three lights—the top, bottom, and middle—flash together at 60 times per minute, they create a clear, rhythmic cue that’s easy for pilots to detect and interpret. About one flash per second provides strong visibility in both day and night conditions and helps convey the tower’s full vertical extent, reducing the chance of misjudging its height or location. If lights were only at a single position or flashed more slowly, the structure would be less conspicuous and harder to spot from certain viewpoints or distances.

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