The planes are cramped, unheated and unpressurized.

机舱又窄又冷 并且不承压。

456. Request descent rate less than 500 feet per minute due to unpressurized cabin.

456. 由于客舱不加压，要求下降率小于每分钟 500 英尺。

The cockpit on the starboard fuselage is manned; the port-side cockpit, meanwhile, is designed to stay empty and unpressurized.

机身右舷的驾驶舱有人驾驶；与此同时， 左舷驾驶舱的设计保持空旷且不加压。