FAA L-866

An FAA L-866 is a white omnidirectional medium intensity aircraft warning light. The beacon flashes at 60 fpm.

FAA L-866 Intensity Requirements

Step	Beam Spread (Degrees)	Effective Intensity (Candela)
Day/Twlight	360 horizontal, 3 minimum vertical	20,000 ±25%
Night	360 horizontal, 3 minimum vertical	2,000 ±25%

Catenary Applications

Catenary lighting systems composed of L-857, L-866 or L-885 lights must have a sequenced flashing characteristic consisting of 3 lighting levels on or near each supporting structure. One light level near the top, one near the bottom or lowest point of the catenary and one midway between the other 2 points. The flash sequence is middle, top and then the bottom.

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L-865 Tower Lights or L-866 Catenary Lights