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by MISSMV on January 10th, 2006

MISSMV

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Are the small round plastic orbs on power lines related to aircraft? If so, how?

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  • by An0nym0us on January 14th, 2006

    An0nym0us

    Yes, while from the ground it is easy to identify where the powerlines are
    against the sky as a backdrop, the thin lines are often difficult to
    see from the air with a varied terrain backdrop. By putting the orbs / balls on the lines, pilots can more easily see the "path" of the powerline.

    Current Federal Aviation Regulations require proponents of new construction to notify the FAA of all structures proposed to be built to a height of 200 feet AGL or higher, and current FAA orders direct the FAA to recommend to proponents that an object proposed to be constructed between 200 feet AGL and 500 feet AGL be marked and/or lighted according to the standards of FAA Advisory Circular (AC) 70/7460-1J, "Obstruction Marking and Lighting." Marking standards contained in AC 70/7460-1J generally specify placement of conspicuously-colored (e.g. aviation orange, white, or yellow) spherical markers of not less than 36 inches diameter (or other shape markers of equivalent projected area), at intervals not to exceed 200 feet, on the highest wire of catenary structures which cross rivers.

    http://www.faa.gov/ats/ata/ai/index.html
    http://www.faa.gov/ats/ata/ai/AC70_7460_1K.pdf

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