Federal Aviation Regulations
Sec. 23.1399 — Riding light.
(a) Each riding (anchor) light required for a seaplane or amphibian, must be installed so that it can—(1) Show a white light for at least two miles at night under clear atmospheric conditions; and
(2) Show the maximum unbroken light practicable when the airplane is moored or drifting on the water.
(b) Externally hung lights may be used.
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