All Right Reserved. Instead of the journey taking months on a boat, travelers can make the trip in a matter of hours aboard a jet airliner. As you go higher, the amount of air pressure drops significantly and the air molecules are able to spread out. ANN Welcomes Lakeland 2006 Sponsor: GARMIN! With the exception of certain military aircraft, all airplanes have a pressurized cabin. Thanks for giving me an opportunity to answer the question… The air pressure inside the cabin is always kept higher than the outside atmospheric pressure at high altitudes. So what happens if the airplane you are flying on actually loses pressurization at cruising altitude? All airplanes, barring certain military aircraft, have a pressurized cabin.It is a crucial part of designing an aircraft because the purpose of pressurizing cabins is to ensure a safe and comfortable environment for passengers and flight crew at high altitudes. Airplanes are pressurized because the air is very thin at the altitude they fly. At cabin pressure altitudes above 15,000 feet (MSL) unless each occupant of the aircraft is provided with supplemental oxygen. After that, you may still be conscious, but your cognitive ability is going to be greatly hindered to where you won’t even remember what you were trying to do. The answers to this are pretty simple. If you’re wondering how safe commercial aircraft really are, check out our post Can Airplanes Fly Safely in Bad Weather? Many airliners also use what is called “bleed air” from the engines. Air is pumped into the cabin, and because the cabin is sealed, the pressure increases. This is why the Federal Aviation Regulations Part 91.211 states the following: No person may operate a civil aircraft of U.S. registry: No person may operate a civil aircraft of U.S. registry with a pressurized cabin: Lets look at the more scientific aspect of pressure and altitude. This YouTube video has the audio recording of 2 pilots that have had some kind of cabin pressurization issue and are suffering the effects of hypoxia. Airplane cabins are pressurized by forcing air into the cabin. Loss of consciousness, including fainting or seizures. The pressurization control system keeps the airplane cabin interior at a safe altitude. What are Aircraft Transponders & Emergency Squawk ... Analyzing the Kobe Bryant Helicopter Crash: What Happened? Just like you pressurize a car tire by flowing air into it, airplanes do the same for the cabin. The effects of hypoxia effect everyone differently so it’s important to have supplemental oxygen in your smaller aircraft even if climbing above 10,000 – 12,000 ft. At typical cruising altitudes in the range 11 000–12 200 m (36 000–40 000 feet), air pressure in the cabin is equivalent to the outside air pressure at 1800–2400 m (6000–8000 feet) above sea level. Just like you pressurize a car tire by flowing air into it, airplanes do the same for the cabin. If there is an object that has a difference of pressure inside rather than outside, bad things can happen right? Airplanes that fly at high altitudes are usually pressurized in order to eliminate the need for passengers and crew to breathe extra oxygen during the flight. Not breathing, or not expelling air when exhaling. ", are you thinking that cabin pressure is greater than 1 atmosphere? Positive Relief Valves – These are basically spring loaded valves that vent any excess pressure when the inside cabin pressure exceeds a maximum threshold. For aircraft, this air is usually bled off from the gas turbine engines at the compressor stage, and for spacecraft, it is carried in high-pressure, often cryogenic tanks. Air pressure is the result of the weight of all the air that's above you. Air is pumped into the cabin, and because the cabin is sealed, the pressure increases. Airplane cabins are all pressurized, which allows passengers to breathe as easily on the ground as they do at the maximum cruising altitude. This site is owned and operated by AviatorsHQ LLC, a limited liability company headquartered in California, USA. Pressurized cabins are usually maintained between 11 and 12 psi.
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