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必备导航性能（RNP，RequiredNavlsatlonPerformance），是指飞机在一种特定允许的过近、着陆路径限制的“隧道”里，保持一种标称的飞行剖面。一旦飞机及其导航系统达到RNP的要求，就能成功地穿越隧道，安全着陆。按照国际民航公约附件1的定义，RNP实际上就是一种隧道。无论RN
RNP (RequiredNavlsatlonPerformance) means that the aircraft maintains a nominal flight profile in a “tunnel” that is specifically permitted for over-approach and landing path restrictions. Once the aircraft and its navigation system meet RNP requirements, they can successfully cross the tunnel and land safely. RNP is actually a tunnel as defined in Annex 1 of the ICAO Convention. No matter RN