本AIR的目的是为飞机仪表盘和面板显示器中使用的字符和符号的最小尺寸提供建议，与第段所述条件相关。3.许多变量影响飞机仪表表盘字符的易读性。这种情况使得很难（如果不是不可能）建立一个精确的规则来优化所有安装。字符大小是重要的考虑因素之一，可以在有足够拨号空间的地方进行优化。通常情况下，情况并非如此，设计师面临着将信息放在有限的空间中，同时继续努力确保无错误的易读性。本文规定了适当的最小尺寸要求，以指导航空运输的使用。

The purpose of this AIR is to provide recommendations for the minimum dimensions of characters and symbols used in aircraft instrument dials and panel displays as related to the conditions stated in para. 3.Numerous variables influence the legibility of aircraft instrument dial characters. This situation makes it very difficult, if not impossible, to establish an exact act of rules for optimizing all installations.Character size, one of the important considerations, can be optimized where adequate dial space exists. Usually this is not the case and the designer is faced with placing the information in a limited space while continuing to strive for error-free legibility. Appropriate minimum size requirements have been stated herein for guidance in air transport use.