This International Standard specifies the dimensional, structural requirements and environmental conditions applicable to 2.44 m (8 ft) wide pallets for use in large capacity aircraft, with fixed wings, in cargo version, and for the purpose compatible with air/surface cargo containers of cross-sectional area 2.44 x 2.44 m (8 x 8 ft), as described in the International Standards for these containers. The pallet networks to be used in conjunction with these pallets are described in Standard UNE 38-538 (ISO 4115). This International Standard establishes two classes of pallets: Type A for exclusive use in aviation, and Type B for air/surface transport. The pallets will have a nominal width of 2.44 m (8 ft) and nominal lengths of 3 m, 6 m, 9 m and 12 m (10 ft, 20 ft, 30 ft and 40 ft). Air transport-only pallets (Type A) are typically handled on various aircraft roller load transfer systems, and/or on ground equipment equipped with equivalent transfer systems. Pallets for air/surface transport (Type B) will accommodate the handling and air/surface transport systems. Supplementary requirements for Type B pallets are described in section 4.