[Haichuan Tea House] Why is the temperature in the airplane cabin relatively cold?

I heard that high temperatures can affect oxygen inhalation, causing hypoxemia and discomfort.

When the temperature is high, people are more likely to feel irritable. Confined spaces require calmness.

The temperature is lower, reducing the emission of some odors

The air in the aircraft is directly inhaled by the engine. After being compressed and cooled by the air-conditioning component, the fresh air is directly introduced into the cabin. All the original air in the cabin is automatically discharged from the fuselage through the on-board exhaust system and is no longer recycled.

At 7:57 on August 9, Shenzhen Airlines passenger plane ZH9209 issued emergency code 7700 and then returned. Prior to this, the passenger plane had dropped from 9297 meters to 3733 meters. It is understood that the flight was planned to fly from Shenzhen to Xi'an. About 25 minutes after taking off from Shenzhen Baoan Airport at 7:32, the altitude suddenly dropped. Then the flight began to return, and the transponder code also changed from 7700 to a normal code, indicating that the aircraft emergency was under control and the crew could control the aircraft to land normally. The reporter contacted Shenzhen Airlines and learned that no crew members or passengers were injured after landing. Shenzhen Airlines will arrange other flights to transport passengers in the future. The cause of the accident is still under further investigation. After descending to about 3,700 meters, the plane began to return. The passenger plane was originally scheduled to fly from Shenzhen to Xi'an. It took off from Shenzhen Bao'an Airport at 7:32. About 20 minutes later, it began to descend from about 9,200 meters and displayed the 7700 emergency code. It then dropped to about 3,700 meters, and then the plane began to return. In response, Shenzhen Airlines responded: On August 9, Shenzhen Airlines passenger 330 aircraft performed flight ZH9209 (Shenzhen-Xi'an). The aircraft took off from Shenzhen at 7:32. When it ascended to an altitude of 9,200 meters in the Guangzhou control area, an abnormal pressure indication occurred. The crew handled it according to procedures, descended to a safe altitude, returned to Shenzhen, and landed at Shenzhen Bao'an International Airport at 9:13. At 12:00, Shenzhen Airlines flight ZH9209 was changed to Airbus 330 aircraft numbered B-1036 and continued to perform its mission. It is expected to arrive in Xi'an at 14:15.

Chinese civil aviation pilot and well-known aviation blogger @武明fighter introduced that the sudden descent is not an out-of-control free fall, but an emergency procedure for the crew when encountering a unique failure - a rapid (emergency) descent. A common situation that requires a rapid (emergency) descent is a problem with the pressurization system on the aircraft. Judging from the flight altitude of the aircraft, it is estimated that there is a problem with the pressurization system. After the crew descended to a low altitude, the pressurization was restored, and then climbed to 6,000 meters for inspection. It is estimated that it was still abnormal, and then descended and returned. Dispose of normally, safe and no problem. Judging from the information obtained so far, there is a high probability that there is a problem with the pressurization system of the flight. If the pressurization system fails when the aircraft is flying at high altitude, the oxygen content of the air in the cabin will gradually or sharply decrease, posing a threat to the lives of people on board.

Um. . . Um. . . I've only stayed in the cabin, so I don't know what the temperature is in other places, or whether it's colder. In the movie "Prison in the Sky", wasn't there a criminal who chased a plane and ended up freezing to death in the cargo hold?

The temperature in the warehouse is the same as that in the upper air. Isn't there a report of someone hiding in the landing gear position if it is very low?