(e)
[Ifthe rearpositionlight,whenmounted asfaraft aspracticablein accordancewith Sec. 29.1385(c), cannot show unbroken light within dihedral angle A (as de.ned in paragraph (d) of this section), a solid angle or angles of obstructed visibility totaling not more than 0.04 steradians is allowable within that dihedral angle, if such solid angleis within a conewhoseapexisatthe rearpositionlightand whose elements make an angle of 30'with a verticallinepassing through the rearposition light.]

Amdt. 29-9, E.. 11/5/71
FAR 29.1389 : Position light distribution and intensities.
(a)
General. The intensities prescribed in this section must be provided by new equip-ment withlight coversand color .ltersinplace.Intensitiesmustbedetermined with thelight source operating at a steady value equal to the averageluminous output of the source at the normal operating voltage of the rotorcraft. The light distribution andintensity of eachpositionlight must meet the requirements ofparagraph(b) of this section.

(b)
Forward and rear position lights. The light distribution and intensities of forward and rear position lights must be expressed in terms of minimum intensities in the horizontal plane, minimum intensities in any vertical plane, and maximum intensities in overlapping beams, within dihedral angles, L, R, and A, and must meet the following requirements :

(1)
Intensities in the horizontal plane. Each intensity in the horizontalplane(the plane containing the longitudinal axis of the rotorcraft and perpendicular to the plane of symmetry of the rotorcraft), must equal or exceed the values in Sec. 29.1391.

(2)
Intensitiesin any verticalplane.Eachintensityin any verticalplane(theplane perpendicular to the horizontal plane) must equal or exceed the appropriate value in Sec. 29.1393 where I is the minimum intensity prescribed in Sec. 29.1391forthe corresponding anglesinthehorizontalplane.

(3)
Intensities in overlaps between adjacent signals. No intensity in any overlap between adjacent signals may exceed the values in Sec. 29.1395, except that higherintensitiesin overlaps maybe usedwiththe use of mainbeamintensities substantiallygreater than the minima speci.edinSecs.29.1391 and29.1393if

′
Elodie Roux. Septembre 2003
Subpart F : Equipment
the overlapintensitiesin relationto the mainbeamintensitiesdo not adversely a.ect signal clarity.
FAR 29.1391 : 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, measu-red from dead ahead ''  Intensity (candles) 
L and R (forward red and green).  0to 1010'to 20' 20'to 110' ''  40 30 5 
A (rear white)  110to 180 20 

FAR 29.1393 : 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. 

FAR29.1395 :Maximumintensitiesinoverlapping beamsofforward and rear position lights.
No position light intensity may exceed the applicable values in the following table, except asprovidedinSec.29.1389(b)(3).
Maximum intensity 
Overlaps  Area A (candles)  Area B (candles) 
Green in dihedral angle L  10  1 
Red in dihedral angle R  10  1 
Green in dihedral angle A  5  1 
　
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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 5(96)