High-intensity white flashing lights on supports for overhead transmission lines shall flash at __ flashes per minute.

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Multiple Choice

High-intensity white flashing lights on supports for overhead transmission lines shall flash at __ flashes per minute.

High-intensity white flashing obstruction lights are used on tall structures to ensure noticeable conspicuity for pilots at night or in poor visibility. The flash rate is standardized so the cadence is easy to recognize and hard to confuse with other lights. For this type of light, the required rate is sixty flashes per minute, which is one flash per second. This consistent pacing helps pilots judge position and distance to the structure quickly and reliably. Rates like lower or higher numbers aren’t the standard for these white obstruction lights, because they don’t provide the same clear, steady cue in a cockpit environment.

High-intensity white flashing obstruction lights are used on tall structures to ensure noticeable conspicuity for pilots at night or in poor visibility. The flash rate is standardized so the cadence is easy to recognize and hard to confuse with other lights. For this type of light, the required rate is sixty flashes per minute, which is one flash per second. This consistent pacing helps pilots judge position and distance to the structure quickly and reliably. Rates like lower or higher numbers aren’t the standard for these white obstruction lights, because they don’t provide the same clear, steady cue in a cockpit environment.

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