ICAO’s Frangibility Ruling AERODROME DESIGN MANUAL PART 6, Frangibility - First Edition, 2006 states that: ...certain airport equipment and installations, because of their function, must be located in an operational area. All such equipment and installations as well as their supports should be of minimum mass and frangible in order to ensure that impact does not result in loss of control of the aircraft. Among these equipment are for example: • Wind direction indicators Support structures for wind direction indicators, transmissometers and forward-scatter meters should be tested for frangibility in accordance with procedures for approach lighting towers. Exel wind cones are availabe in two configurations: • Externally illuminated wind cone • Internally illuminated wind cone The wind cone can be full size 090 x 360 cm or heliport size 063 x 250 cm. Exel Composites Oy Muovilaaksontie 2 FI-82110 Heinavaara FINLAND

Exel masts are full scale impact tested according to the Aerodrome Design Manual Part 6, chapter 5 and FAA AC 150/5345-45C, section 4 Exel lattice masts provide an excellent base for installation of various weather monitoring instruments. The f irm but lightweight structure is available in a wide range of heights to cover practically any type of installation and ground condition. The standard colouring scheme is orange/white in seven sections, as specified in Annex 14. Other colouring schemes are available. The most typical installation interface for the weather instruments is a spigot at the...