1. cited below are from 1993 and later. The handbook
2. FederalAviationAdministration,Advisory Circular 20-73: "Aircraft IceProtection."
3. FederalAviationAdministration,Advisory Circular 25.1419-1: "Certification ofTransport CategoryAirplanesforFlight inIcing Conditions."
4. FederalAviationAdministration,Type Certificate Data Sheets,TypeData SheetNo. A53EUAerospatiale,ATR-72-212,June 1997, http://www.airweb.faa.gov/Regulatorv and Gui danceJLibrary.