Airport foldable and fragile pole application scope: The supporting structures for all auxiliary navigation equipment in the runway obstruction restriction area.
Fragile and brittle objects — may fracture (break), bend, or yield under specified impact forces, thus becoming less harmful to aircraft as lighter weight objects.
Crimp resistance
Various 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 unexpectedly during takeoff or landing, it poses a danger. All such equipment and their supports must be breakaway and installed as low as possible to ensure that collisions do not lead to aircraft control loss. Breakaway capability can be achieved through various design concepts, such as using lightweight, breakable, and brittle materials, components, and connectors, to ensure that breakaway objects shatter, bend, or yield upon impact.
Flexible and fragile pole structures (hereinafter referred to as "flexible poles") are support structures made in single-pole, tower, and other configurations, utilizing lightweight, fragile materials and flexible structures.
Condition for bending of air freight fragile and fragile shafts
For aircraft with potential for non-liftoff or no-gear landing, the breakable rod must bend and fracture upon impact by an aircraft weighing 3,000 kg and traveling at 140 km/h. For aircraft with potential for no ground sliding, the breakable rod 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.