Federal Aviation Administration, DOT Section 27.1411 (b) Externally hung lights may be used. [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-2, 33 FR 964, Jan. 26, 1968] Anticollision light system. (a) General. If certification for night operation is requested, the rotorcraft must have an anticollision light system that - (1) Consists of one or more approved anticollision lights located so that their emitted light will not impair the crew-s vision or detract from the conspicuity of the position lights; and (2) Meets the requirements of paragraphs (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 configuration and flight characteristics of the rotorcraft. The field of coverage must extend in each direction within at least 30 degrees below the horizontal plane of the rotorcraft, except that there may be solid angles of obstructed visibility totaling not more than 0.5 steradians. (c) Flashing characteristics. The arrangement of the system, that is, the number of light sources, beam width, speed of rotation, and other characteristics, must give an effective flash frequency of not less than 40, nor more than 100, cycles per minute. The effective flash 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 light source. In overlaps, flash frequencies may exceed 100, but not 180, cycles per minute. (d) Color. Each anticollision light must be aviation red and must meet the applicable requirements of Section 27.1397. (e) Light intensity. The minimum light intensities in any vertical plane, measured with the red filter (if used) and expressed in terms of - effective - intensities, must meet the requirements of paragraph (f) of this section. The following relation must be assumed: Ie = I (t )dt 1 0.2 + (t 2 - t1 ) where: Ie = effective intensity (candles). I(t) = instantaneous intensity as a function of time. t2Sectiont1 = flash time interval (seconds). Normally, the maximum value of effective intensity is obtained when t2 and t1 are chosen so that the effective intensity is equal to the instantaneous intensity at t2 and t1. (f) Minimum effective intensities for anticollision light. Each anticollision light effective intensity must equal or exceed the applicable values in the following table: Angle above or below the horizontal plane 0Section to 5Section ................................................................ 5Section to 10Section .............................................................. 10Section to 20Section ............................................................ 20Section to 30Section ............................................................ Effective intensity (candles) 150 90 30 15 [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-6, 36 FR 12972, July 10, 1971; Amdt. 27-10, 41 FR 5290, Feb. 5, 1976] SAFETY EQUIPMENT Section 27.1411 General. (a) Required safety equipment to be used by the crew in an emergency, such as flares and automatic liferaft releases, must be readily accessible. (b) Stowage provisions for required safety equipment must be furnished and must - (1) Be arranged so that the equipment is directly accessible and its location is obvious; and (2) Protect the safety equipment from damage caused by being subjected to the inertia loads specified in Section 27.561. [Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27-11, 41 FR 55470, Dec. 20, 1976] 555 VerDate Sep<11>2014 12:50 Apr 30, 2019 Jkt 247046 PO 00000 Frm 00565 Fmt 8010 Sfmt 8010 Y:\SGML\247046.XXX 247046 EC28SE91.086 spaschal on DSK3GDR082PROD with CFR Section 27.1401 t2 - t