本文件已被宣布为“稳定”，不再接受货币定期审查。用户负责验证参考资料和持续适用性或技术要求。新技术可能存在。本文件的范围仅限于对安装在波音727飞机上并经联邦航空管理局认证用于III类着陆操作的Flight Dynamics，Inc.（FDI）1000WS型平视制导系统（HGS）的显示特性的描述。本文件中描述的符号系指其设计的特定试点任务。还包括特定符号的操作特征描述，以及关于符号约束、源数据或位置错误的任何相关标准。

This document has been declared "Stabilized" and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability or technical requirements. New technology may exist.The scope of this document is limited to descriptions of the display characteristics of the Flight Dynamics, Inc. (FDI) Model 1000WS Head up Guidance System (HGS) as installed on the Boeing 727 airplane and certified by the Federal Aviation Administration for use in Category III landing operations. The symbology depicted in this document is referenced to the particular pilot task(s) for which it was designed. Also included are descriptions of operational features of the particular symbol along with any associated criteria regarding symbology constraints, source data, or position error.