本通告的目的是向各国通报国际民航组织关于在公布的相邻仪表飞行程序（IFP）上实施为到达和离开飞机制定的最小间隔的指南和支持材料。本材料支持《空中导航服务程序——空中交通管理》（PANS-ATM，Doc 4444）中的规定。它规定了使用IFPs的某些基于性能的导航能力飞机之间的两个最小间隔，以及使用保护区的IFPs上的飞机之间的横向间隔。

The purpose of this circular is to apprise States of the ICAO guidelines and supporting material for the implementation of separation minima developed for arriving and departing aircraft on published adjacent instrument flight procedures (IFPs). This material supports provisions included in theProcedures for Air Navigation Services - Air Traffic Managment(PANS-ATM, Doc 4444). It provides for two separation minima between certain performance-based-navigation-capable aircraft utilizing IFPs and lateral separation between aircraft on IFPs using protected areas.