8.6.1 General
Note1 - Requirements for obstacle limitation surfaces are specified in 4.2.
Note2 - The design of light fixtures and their supporting structures, light units of visual approach slope indicators, signs, and markers is specified in 5.3.1, 5.3.6, 5.4.1 and 5.5.1, respectively. Guidance on the frangible design of lights and other navigation aids is given in the ICAO Airport Services Manual, Part6.
8.6.1.1 Standard - Unless its function requires it to be there for air navigation purposes, no equipment or installation shall be:
8.6.1.2 Recommendation - Any equipment or installation required for air navigation purposes which must be located in an area identified in 8.6.1.1, should be regarded as an obstacle and should be of minimum practicable mass and height, be frangible, and sited in such a manner as to reduce the hazard to aircraft to a minimum.
8.6.1.3 Standard - Any equipment or installation required for air navigation purposes which must be located on or near a strip of a precision approach runway and which:
8.6.1.4 Recommendation - Any equipment or installation required for air navigation purposes and which is an obstacle of operational significance in accordance with 4.2.2.7, 4.2.3.5 or 4.2.4.6, should be of minimum practicable mass and height, be frangible, and sited in such a manner as to reduce the hazard to aircraft to a minimum.