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原文传递 Aeronautical Information Publication, United States of America. Twentieth Edition, March 12, 2009.

题名：	Aeronautical Information Publication, United States of America. Twentieth Edition, March 12, 2009.
关键词：	Civil-aviation; Air-navigation; *Airports-.;Tables-Data; Regulations-; Requirements-; International-agreements; Aircraft-landing; Air-traffic-control; Cargo-handling; Freight-transportation; Air-transportation; Navigation-aids.
摘要：	The structure and contents of AIPs are standardised by international agreement through ICAO. AIPs normally have three parts - GEN (general), ENR (en route) and AD (aerodromes). The document contains many charts; most of these are in the AD section where details and charts of all public aerodromes are published. AIPs are kept up-to-date by regular revision on a fixed cycle. For operationally significant changes in information, the cycle known as the AIRAC (Aeronautical Information Regulation And Control) cycle is used: revisions are produced every 56 days (double AIRAC cycle) or every 28 days (single AIRAC cycle). These changes are received well in advance so that users of the aeronautical data can update their flight management systems (FMS). For insignificant changes, the published dates calendar is used.
报告类型：	科技报告