针对已安装的旋翼机变速器记录的维护记录中的服务时间（TIS）或飞行小时数通常用作变速器部件磨损检查间隔要求的官方机翼时间度量，在某些情况下，还用于寿命有限部件的报废更改。本AIR解决了传输TBO扩展的传统方法，并引入了旋翼机传输监控使用指标，该指标可用于通过跟踪扭矩来修改TIS检查，以确定寿命有限零件的负载和部件磨损。这是SAE HM-1委员会的文件，旨在用作技术信息来源，而非法律文件文件或标准。 本AIR没有提供详细的实施步骤，但确实解决了一般实施、过去的经验、关注点和潜在利益。

Time in Service (TIS), or flight hours, logged in maintenance records against an installed rotorcraft transmission is normally used as the ¿¿¿official¿¿¿ time on wing metric for the transmission¿¿¿s component wear out inspection interval requirement and, in some instances, retirement change on life limited parts. This AIR addresses traditional methods of transmission TBO extensions and introduces rotorcraft transmission monitoring usage metrics that could be used to modify TIS inspections by tracking torque to determine both loads on life limited parts and component wear.This is a document of the SAE HM-1 Committee intended to be used as a technical information source and is not intended as a legal document or standard. This AIR does not provide detailed implementation steps, but does address general implementation, past experience, concerns and potential benefits.