Airport fragile pole application scope: Support structures for all navigational aids within the runway obstruction limiting surface.
Fragile and breakable items — become broken (crushed), bent, or yielded under specified impact forces, thereby becoming less harmful lightweight objects to aircraft.
Crispness
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. If an aircraft collides with them during takeoff or landing, it poses a danger. All such equipment and their supports must be collapsible and installed as low as possible to prevent collision from causing aircraft control loss. Collapsibility can be achieved through various design concepts, such as using lightweight, easily collapsible, and brittle materials, components, and connectors, to ensure that collapsible objects break, bend, or yield upon impact.
Flexible and fragile poles (hereinafter referred to as "flexible poles") are support structures made in single-pole, tower-type, and other configurations, utilizing lightweight fragile materials and flexible structures.
Condition for bendability of aviation easily breakable and fragile rods
For aircraft components that may not withstand a landing or emergency descent, the breakable rods must bend and fracture upon impact by an aircraft weighing 3,000 kg and traveling at 140 km/h. For components that may not slide on the ground during a collision, the breakable rods must bend and fracture upon impact 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.