Airworthiness Standards; Rain and Hail Ingestion Standards

These amendments establish revisions to the Federal Aviation Administration's certification standards for rain and hail ingestion for aircraft turbine engines. These amendments address engine power- loss and instability phenomena attributed to operation in extreme rain or hail that are not adequately addressed by current requirements. These amendments also generally harmonize these standards with rain and hail ingestion standards being amended by the Joint Aviation Authorities (JAA). These amendments establish nearly uniform standards for engines certified in the United States under 14 CFR part 33 and in the JAA countries under Joint Airworthiness Requirements-Engines (JAR- E), thereby simplifying the certification of engine designs by the FAA and the JAA.