What type of chocks are authorized for land-based use?

Polyurethane chocks are specified for land-based use because they offer a combination of durability, flexibility, and resistance to wear under various conditions. They are effective in preventing aircraft movement and can withstand the rigors of outdoor storage and operations, making them ideal for use on a variety of surfaces.

Wooden chocks, while traditional, may not provide the same level of durability and resistance to environmental factors over time, leading to potential degradation. Metal chocks can be too hard and may cause damage to the aircraft if improperly placed or if they shift. Rubber chocks, on the other hand, might not provide the necessary strength and can wear out over extended use, failing to offer reliable support.

Polyurethane chocks are specifically designed to meet the rigorous demands of land-based operations, providing effective stabilization for aircraft while remaining resilient and long-lasting. This quality ensures safety and reliability when securing aircraft at ground facilities.