Standard 621, Obstruction Marking and Lighting, 1st Edition, dated 31 December 2011 is cancelled by this publication. The requirements of this edition are effective 30 days after the date of publication. The purpose of this publication is to provide standards for marking and lighting of objects that present a hazard to the safe operation of aircraft. Appendix C Aeronautical Assessment Form for Obstruction Marking and Lighting.Appendix B Specification for Obstruction Lighting Equipment. Chapter 16 - Light Intensity Reduction (LIR) System (effective 6).Chapter 15 - Aircraft Detection System (ADS).Chapter 13 - Obstruction Lighting Characteristics.Chapter 12 - Marking and Lighting of Wind turbines and Wind farms (effective 1).Chapter 11 - Marking and Lighting of Tethered Objects (effective 1).Chapter 10 - Marking and Lighting of Catenaries.Chapter 9 - Dual Red/White High Intensity System, Configuration "F" (effective 1).Chapter 8 - Dual Red/White Medium Intensity System, Configuration "E" (effective 1).Chapter 7 - High Intensity White System, Configuration "B" and "C" (effective 1).Chapter 6 - Medium Intensity White System, Configuration "D" (effective 1).Chapter 5 - Red Obstruction Lighting System, Configuration "A".Chapter 3 - Marking and Markers, General (effective 1).Last amendment to standard: 2 Table of contents
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