This International Standard establishes the minimum requirements for aircraft de-icing/anti-icing methods on the ground, in accordance with the ICAO Manual of aircraft ground de-icing/anti-icing operations (Doc. 9640-AN/940) and relevant national regulations, to facilitate the safe operation of transport aircraft during icing conditions. This International Standard does not specify requirements for specific aircraft model types. Aircraft manufacturers' published manuals, procedures or methods take precedence over the information in this International standard. Airlines' published manuals, procedures or methods supplement the information contained in this International Standard. Frost, ice or snow deposits, which can seriously affect the aerodynamic performance and/or controllability of an aircraft, are effectively removed by the application of the procedures specified in this International Standard. De-icing/anti-icing by mechanical means is not covered by this International Standard.