14 CFR § 139.341 - Identifying, marking, and lighting construction and other unserviceable areas.
(1) Mark and, if appropriate, light in a manner authorized by the Administrator -
(iii) Any area adjacent to a NAVAID that, if traversed, could cause derogation of the signal or the failure of the NAVAID; and
(2) Provide procedures, such as a review of all appropriate utility plans prior to construction, for avoiding damage to existing utilities, cables, wires, conduits, pipelines, or other underground facilities.
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