At cruising altitude, cabin pressure pushes that door shut with 12,000 pounds of force. Inside the cabin, air pressure is higher than outside air pressure at 35,000 feet. Outside temperature is minus 60 degrees and pressure is one quarter what it is on ground. Airplane doors sit slightly inside the cabin, narrower than the frame opening itself. Higher pressure inside pushes the door deeper into its frame, like a cork in a bottle. Even the strongest person cannot pull that door open during flight, the pressure difference is too massive. There is a mechanical release handle hidden inside the cabin wall near the door frame. Before opening at the gate, a flight attendant disarms the pressurization lock manually. Once on ground and parked, cabin pressure matches outside air within seconds. Pilots pressurize the cabin to feel like 8,000 feet altitude, not 35,000 feet. At actual 35,000 feet, passengers would pass out in minutes without oxygen. Modern aircraft have not lost a door in flight for over 40 years of commercial service. No locks, no bolts, just physics and cabin pressure keeping you safely sealed inside. Follow Aviation Explained to understand more of how your plane actually keeps you safe.
More videos by Aviation Explained →
Watch on Yesodi → Join Yesodi →