1.检查单分析
条件：一个或多个登机门未关闭并锁好。
登机门，勤务门，翼上出口，是一类。
货舱门，设备舱门是一类。
为啥登机门之类的就不用释压来降低压差，因为结构上首先你看的到，其次结构设计，造成不会大压差，除非直接爆破性释压。那你也不会做这个检查单，而是直接去做座舱喇叭响检查单了。
看看官方回复这个问题
“The difference in various door checklists is because of the location of the cabin and exit doors (which can be visually verified to be in place) and the possibility of damage. Because of the plug type design of the entry, service and overwing doors, cabin pressurization should be secure unless some type of damage to the door has occurred.
Damage is much more likely to occur, and be much more severe, to an equipment or cargo door and these exterior doors cannot be visually verified to be in place.
In addition, if damage has occurred to an entry, service or overwing door such that pressurization is not normal, it will most likely result in a slower loss of pressurization than with one of the exterior doors.The intent of the precaution is to prevent holding the outflow valve switch against the open stop for a prolonged period of time, which can result cabin altitude changes significant enough to cause injuries.
”
翼上出口和登机门、勤务门一样，但是稍有不同的是，登机门和勤务门在决定判断增压正不正常之前，得先判断一下门的手柄的位置。
思维导图
