This SAE Aerospace Recommended Practice (ARP) defines minimum requirements for an aircraft transport ULD to transport horses properly and safely by air@ to protect the horse(s) from injuries@ and to protect the aircraft from corrosion created by waste spill. The ULD is designed to accommodate one horse or several. There are two types of ULDs for aircraft transportation of horses: a. Type 1: The ULD is an airworthiness certified structural container@ satisfying the requirements of NAS 3610 or AS36100 for the appropriate base size. b. Type 2: The ULD consists of a self-contained stall which is positioned on a standard aircraft pallet and restrained to the pallet by means of a cargo pallet net or by straps. WARNING: It is the carrier's responsibility to obtain airworthiness approval foe a Type 2 unit using strap-restraint. Refer to 7.1b (Documentation). Purpose This document provides recommendations for the design of unit load devices for transportation of horses in an approved aircraft cargo compartment and restraint system that complies with the cargo restraint requirements of Title 14 CFR Part 25@ except for the 9.0 g forward ultimate inertia force of ??5.561 (b)(3)(ii).