Why can't the plane open the window? Helicopters can do it.

Very simple, high altitude, extremely low temperature, thin air. Let's talk about the temperature first. Wikileaks of British Airways Flight 38 can tell you that when Flight 38 flew from Beijing to London, it passed over Mongolia and Siberia, and the ambient temperature could reach minus 65- minus 74 degrees Celsius. No. What time is it now? What is the lowest temperature in Siberia in June 5438 +2008 10? As a reference, in Novosibirsk. The average minimum temperature is MINUS 20.9 degrees Celsius, and the extreme minimum temperature is MINUS 46.2 degrees Celsius. You can imagine the difference between the ground temperature and the upper air temperature. How can you open the window when the temperature is so low? Why can you breathe freely in the cabin at the cruising altitude with thin air? It's simple. When the modern aircraft is at cruising altitude, the cabin is of pressurized Haverland comet type, and an air crash occurred because the cabin was not pressurized. As for why Helius Flight 522 can't be opened for this reason, you can know the accident of American Airlines Flight 96, Turkish Airlines Flight 98 1 and United Airlines Flight 8 1 1. CCAR stipulates that passenger planes must be able to fly in ventilation window. A plane that can't fly can't pass the trial certification. Article 773 (b)(2)(i) of CCAR-25-R4: When the cockpit is not pressurized, the window that can be opened under the conditions specified in (b)( 1) of this article can provide the visual field specified in this article, and can also give the driver sufficient protection to prevent wind and rain from affecting his observation ability;

CCAR stipulates that ventilation window must be able to fly passenger planes under any circumstances. If you can't open it (including under pressure), you can't pass the airworthiness certification (I'll correct the typo for you). In this case, it violates the premise of Article 773 of CCAR-25-R4. As for CCAR-25-R4, is it stipulated that ventilation window must be able to open it without pressure?