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ARP定义了一个推荐标牌，用于识别飞机液压系统中使用飞机磷酸酯流体的设备，以确保内部密封件/材料与系统流体之间的兼容性。文件中提供了耐用型的定义，并附有半永久性标牌，其中规定了允许液体的文本。

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.This ARP defines a recommended placard for readily identifying equipment with aircraft phosphate ester fluid to be used in the aircraft hydraulic system to assure compatibility between the internal seals/materials and the system fluid. A definition is provided for a durable type and semipermanently attached placard with prescribed text for the permissible fluid are included in the document.