SAE AIR4174A的目的是为管理层、设计师和操作员提供信息，以帮助他们决定需要哪种类型的动力传动系监控。本文件旨在为优化系统复杂性、性能和成本效益提供帮助。本文件涵盖了从涡轮或往复式发动机中的飞机推进能量通过齿轮系转换为推进用机械能时起的所有动力系元件。该文件涵盖了飞机发动机驱动的变速箱和齿轮箱部件、它们的接口、传动系轴系、传动轴悬挂轴承以及相关的旋转附件、螺旋桨和转子系统，如图1所示。 有关监控本文未提及的其他发动机部件（例如主轴轴承和压缩机/涡轮转子）的指南，请参阅ARP1839。本文件介绍了商用和军用飞机上转子、涡轮螺旋桨、涡轮风扇、螺旋桨风扇和升力风扇传动系统的旋转和固定翼应用。

The purpose of SAE AIR4174A is to provide management, designers, and operators with information to assist them to decide what type of power train monitoring they desire. This document is to provide assistance in optimizing system complexity, performance and cost effectiveness.This document covers all power train elements from the point at which aircraft propulsion energy in a turbine or reciprocating engine is converted via a gear train to mechanical energy for propulsion purposes. The document covers aircraft engine driven transmission and gearbox components, their interfaces, drivetrain shafting, drive shaft hanger bearings, and associated rotating accessories, propellers, and rotor systems as shown in Figure 1. For guidance on monitoring additional engine components not addressed, herein (e.g., main shaft bearings and compressor/turbine rotors), refer to ARP1839.This document addresses rotary and fixed wing applications for rotor, turboprop, turbofan, prop fan, and lift fan drive trains on both commercial and military aircraft.