本文件包含的信息可供航空运输行业用于评估飞机内部楼梯的设计，以确保乘客和机组人员在正常运行条件和紧急疏散时的安全。

This document contains information that can be used by the air transportation industry to evaluate the design of airplane interior stairways with respect to the safety of passengers and crew in normal operating conditions and emergency evacuations.