Airport Monitoring Equipment - Fragile and Breakable Rod

Airport foldable and fragile pole application scope: The supporting structures of all auxiliary navigation equipment in the runway obstacle restriction area.
Fragile and brittle items — under specified impact forces, they may break (shatter), bend, or yield, thus becoming less harmful lightweight objects to aircraft.
Crippliness
Various visual and non-visual navigation facilities at airports (such as approach lighting towers, meteorological equipment, radio navigation equipment, etc.) are generally located near runways, taxiways, and aprons. If an aircraft taking off or landing collides with them unexpectedly, it 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, 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, and other configurations, utilizing lightweight, fragile materials and a flexible design.
Condition for bendability of aviation easily breakable and fragile rods
Collapsible rods for aircraft that may not abort a descent must be collapsible and breakable upon impact from an aircraft weighing 3,000 kg and traveling at 140 km/h. For aircraft that may not taxi on the ground, the collapsible rods must also be collapsible and breakable upon impact from an aircraft weighing 3,000 kg and traveling at 50 km/h. The force exerted by the collapsible rod on the aircraft during impact should not exceed 45 kN; the energy transferred to the aircraft by the collapsible rod should not exceed 55 kJ.