Airport Foldable and Breakage-Resistant Pole Application Scope: Supporting structures for all aid devices within the runway obstruction marking area.
Fragile and breakable items — under specified impact forces, these items may fracture (break), bend, or yield, reducing their hazard to aircraft as lightweight objects.
Fragility
Visual and non-visual navigation facilities at airports, such as approach lighting towers, meteorological equipment, and radio navigation equipment, are typically located near runways, taxiways, and aprons. Failure to avoid collisions with these facilities by aircraft taking off or landing can pose a danger. All such equipment and their supports must be collapsible and installed as low as possible to ensure that collisions do not lead to aircraft control loss. Collapsibility can be achieved through various design concepts, such as using lightweight, brittle, and low-toughness materials, components, and connectors, to ensure that collapsible objects break, bend, or yield upon impact.
Flexible and fragile pole towers (hereinafter referred to as "flexible poles") are support structures made in single-pole, tower frame, and other configurations, utilizing lightweight, fragile materials and a flexible structure.
Condition for folding and breakage of aviation easily breakable and fragile rods
For aircraft with potential for non-liftoff or no-landing collisions, the breakable rod must be easily breakable and碎 when struck by an aircraft weighing 3,000 kg and traveling at 140 km/h. For aircraft with potential for non-ground sliding collisions, the breakable rod must be easily breakable and碎 when struck by an aircraft weighing 3,000 kg and traveling at 50 km/h. The force exerted by the breakable rod on the aircraft during impact should not exceed 45 KN; the energy transferred to the aircraft by the breakable rod should not exceed 55 KJ.