(2)
Intensitiesin any verticalplane.Eachintensityin any verticalplane(theplane perpendicular to the horizontal plane) must equal or exceed the appropriate value in Sec. 25.1393, where I is the minimum intensity prescribed in Sec. 25.1391forthe corresponding anglesinthehorizontalplane.

(3)
Intensities in overlaps between adjacent signals. No intensity in any overlap between adjacent signals may exceed the values given in Sec. 25.1395, except that higher intensities in overlaps may be used with main beam intensities

substantiallygreater than the minima speci.edinSecs.25.1391 and25.1393if the overlapintensitiesin relationto the mainbeamintensitiesdo not adversely a.ect signal clarity.Whenthepeakintensity of theforwardpositionlightsis more than 100 candles, the maximum overlap intensities between them may exceed the valuesgiveninSec.25.1395if the overlapintensityinAreaAis not more than10percent ofpeakpositionlightintensity and the overlapintensity in Area B is not greater than 2.5 percent of peak position light intensity.
FAR 25.1391 : Minimum intensities in the horizontal plane of forward and rear position lights.
Each position light intensity must equal or exceed the applicable values in the follo-wing table :
Dihedral angle (light included)  Angle from right or left of longitudinal axis, measured from dead ahead ''  Intensity (candles) 
L and R  0to 10''  40 
(forwardred and green).  10to 20''  30 
20to 110''  5 
A (rear white)  110to 180 20 

FAR 25.1393 : Minimum intensities in any vertical plane of forward and rear position lights.
Each position light intensity must equal or exceed the applicable values in the follo-wing table :
Angle above or below the horizontal plane : '  Intensity 
0''  1.00 I. 
0to 5''  0.90 I. 
5to 10''  0.80 I. 
10to 15''  0.70 I. 
15to 20''  0.50 I. 
20to 30''  0.30 I. 
30to 40''  0.10 I. 
40to 90 0.05 I. 

FAR25.1395 :Maximumintensitiesinoverlapping beamsofforward and rear position lights.
No position light intensity may exceed the applicable values in the following table, except asprovidedinSec.25.1389(b)(3).
Maximum intensity 
Overlaps  Area A  Area B 
(candles) (candles) 
Green in dihedral angle L  10  1 
Red in dihedral angle R  10  1 
Green in dihedral angle A  5  1 
Red in dihedral angle A  5  1 
Rear white in dihedral angle L  5  1 
Rear white in dihedral angle R  5  1 

′
Elodie Roux. Septembre 2003
Subpart F : Equipment
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 25.1397 : 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 ”y0 -0.010”,whicheveristhesmaller; and ”y” is not greater than ”x + 0.020” nor ”0.636 -0.400x”;
　
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本文鏈接地址：FAA規(guī)章 美國聯(lián)邦航空規(guī)章 Federal Aviation Regulations 4(26)