Where-
(a)
Area A includes all directions in the adjacent dihedral angle that pass through the light source andintersect the commonboundaryplane at more than10degreesbut less than 20 degrees; and
(b)
Area B includes all directions in the adjacent dihedral angle that pass through the light source and intersect the common boundary plane at more than 20 degrees.
FAR 27.1397 : Color speci.cations
Eachpositionlight colormusthavethe applicableInternationalCommission onIllu-mination chromaticity coordinates as follows :
(a)
Aviation red– ”y” is not greater than 0.335; and ”z” is not greater than 0.002.
(b)
Aviation green– ”x” is not greater than 0.440–0.320y; ”x” is not greater than y–0.170; and ”y” is not less than 0.390–0.170x.
(c)
Aviation white– [”x”is not less than 0.300 and not greater than 0.540; ”y” isnotlessthan ”x–0.040” or ”yo —0.010”,whicheveristhesmaller; and ”y” is not greater than ”x + 0.020” nor ”0.636–0.400x”;
Where ”yo” is the ”y” coordinate of the Planckian radiator for the value of ”x” conside-red.] Amdt. 27-6, E.. 8/11/71
FAR 27.1399 : Riding light
(a)
Each riding light required for water operation must be installed so that it can–
(1)
[Show a white light for at least two nauticalmiles at night under clear atmos-pheric conditions; and]
(2)
Show a maximumpracticableunbrokenlightwith the rotorcraft onthe water.
(b)
Externally hung lights may be used. Amdt. 27-2, E.. 2/25/68
FAR 27.1401 : Anticollision light system
(a)
General.If certi.cationfornight operationisrequested,therotorcraft musthavean anticollision light system that–
(1)
Consists of one or more approved anticollision lights located so that their emittedlight will notimpairthe crew’s visionordetractfromthe conspicuity ofthepositionlights; and
(2)
Meetsthe requirements ofparagraphs(b) through(f) of this section.
(b)
Field of coverage. The system must consist of enough lights to illuminate the vital areas around the rotorcraft, considering the physical con.guration and .ight cha-racteristics of the rotorcraft. The .eld of coverage must extend in each direction within at least 30 degrees above and 30 degrees below the horizontal plane of the rotorcraft, except that there may be solid angles of obstructed visibility totalling not more than 0.5 steradians.
(c)
Flashing characteristics. The arrangement of the system, that is, the number oflight sources, beam width, speed of rotation, and other characteristics, must give an e.ective .ashfrequency of notlessthan40,normorethan100,cyclesperminute. The e.ective .ash frequency is the frequency at which the rotorcraft’s complete anticollision light system is observed from a distance, and applies to each sector of light including any overlaps that exist when the system consists of more than one lightsource.Inoverlaps, .ashfrequenciesmay exceed100,butnot180,cyclesper minute
(d)
[Color. Each anticollision light must be aviation red and must meet the applicable requirements of Sec. 27.1397.]
(e)
Light intensity. The minimum light intensities in any vertical plane, measured with thered.lter(if used) and expressedintermsof ”e.ective” intensities,mustmeet therequirementsofparagraph(f) ofthissection.Thefollowing relationmustbe
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