Airport Monitoring Equipment - Fragile and Easily Breakable Rod

Airport foldable and fragile pole application scope: Support structures for all navigational aids within the runway obstacle limitation surface.
Fragile and brittle items — objects that will break (shatter), bend, or yield under specified impact forces, thereby reducing the hazard to aircraft from lighter-weight objects.
Fragility
Various visual and non-visual navigation facilities at airports (such as approach lighting towers, meteorological equipment, radio navigation equipment, etc.) are typically located near runways, taxiways, and aprons. If an aircraft taking off or landing collides with them unintentionally, it could pose a hazard. 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 characteristics 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-like, and other configurations, utilizing lightweight, fragile materials and flexible structures.
Condition for bendability of aviation easily breakable and fragile rods
For aircraft parts that may not withstand a collision with an aircraft that is not capable of taking off or landing, the bendable rod must bend and break upon impact by an aircraft weighing 3,000 kg and traveling at 140 km/h. For aircraft parts that may not slide on the ground during a collision, the bendable rod must bend and break upon impact by an aircraft weighing 3,000 kg and traveling at 50 km/h. The force exerted by the bendable rod on the aircraft during impact should not exceed 45 KN; the energy transferred to the aircraft by the bendable rod should not exceed 55 KJ.