the bottom surface of an aircraft , such as an osprey v - 22 propeller driven aircraft , has at least four distributed hook attachment points . a load suspension apparatus is attached to the four attachment points with elongated slings . the load suspension apparatus includes an upper rigid frame and a lower rigid frame of lesser dimensions . the lower frame is suspended from the upper frame with v - shaped slings . a cargo load is attached to the lower frame . the load suspension apparatus provides stable attachment of loads to tilt wing and rotary wing aircraft at high aircraft speeds , at transitions between high and low speeds and through aircraft turns .