Text in force at 27-51: from 27-0, effective 1 Feb 1965.
No position light intensity may exceed the applicable values in the following table, except as provided in Sec. 27.1389(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 Red in dihedral angle A ------------------------ 5 1 Rear white in dihedral angle L -------------- 5 1 Rear white in dihedral angle R ------------- 5 1 Where- (a) Area A includes all directions in the adjacent dihedral angle that pass through the light source and intersect the common boundary plane at more than 10 degrees but 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.
29 FR 15695 · Source