This Aerospace Recommended Practice (ARP) specifies minimum performance and compatibility requirements for air cargo unit load device (ULD) ground handling and transport systems equipment employed to service wide-body freighter aircraft operations. The requirements of this document are applicable to ground handling and transport systems equipment which is designated to accommodate main deck unitized cargo in the form of intermodal containers and other compatible unitized load devices. Intermodality in the context of this ARP concerns primarily air and land modes but does not exclude the marine mode. Equipment with compatibility features for other than main deck cargo is likewise not excluded.