本文件的目的有三个:（1）审查与航空电子设备中水分相关的问题，（2）概述纠正现有航空电子设备中水分过多情况的方法，以及（3）建议新航空电子设备冷却系统安装的设计实践，以尽量减少航空电子设备中水分过多的发生。本文件未涉及可能适用于航空电子设备安装的所有与湿气相关的要求。例如，当飞机分开或存放时，空调系统不工作，或者如果使用航空电子地面冷却风扇，飞机及其设备将暴露在室外环境中，并且必须承受室外环境的影响（例如，高湿度、雾、雨和表面冷凝）。

The purpose of this document is threefold: (1) to review the issues associated with moisture in avionics equipment, (2) to outline methods for correcting conditions of excess moisture in existing avionics installations, and (3) to recommend design practices for new avionics cooling system installations which will minimize the occurences of excess moisture in avionics.This document does not address all moisture-related requirements which may be applicable to the avionics installation. For instance, when the air conditioning system is inoperative when the aircraft is parted or stored, or if an avionics ground cooling fan is employed, the aircraft and its equipment will be exposed to and must withstand the effects of the outdoor environment (e.g., high humidity, fog, rain, and surface condensation).