Boeing 747-8 -a chat about cabin altitude/Depressurisation

Hello and how do you do everyone? In this clip, I talk about depressurisation and why we need to put on our oxygen masks if there is a loss of cabin pressure. You listen to the airline safety video every time you fly and have heard it many times. The higher you climb, the air has less oxygen as it is thinner than at sea level. Aircraft structures are built to be pressurised so that they present passengers and crew with sufficient breathable air during the flight. A loss of this protective feature such as having a door or window blow out, will depressurise the cabin and you would suddenly find yourself gasping for oxygen as the aircraft cabin equalised to that of whatever altitude you are flying. That is why oxygen must be provided in such an emergency. The pilots then have to make a rapid descent to a lower altitude where there will be no requirement for oxygen as it is limited usually to about 15 minutes to get down before it runs out.
Have a listen and hope it makes sense. Chi Di Gin! Later😀✈️✈️✈️✈️
Filming in flight was done by ‪@justplanes‬ and is copyright protected.

[@riverbankfisher]

This highly informative short clip is appreciated, Captain

[@winniew6742]

Did l hear Nairobi. This lessons have never been more practical than today❤

[@smithy280663]

a perfect non medical explanation of perfusion at sea level compared to 5000 ft...........

[@mita6010]

Very informative. I lived in Santa Fe, New Mexico at 7000ft and used to hike up to 9,000 ft. When I moved to Colorado at 5000ft, it felt like I was super woman. Many athletes come to where I live to train, mainly runners and cyclists. Thank you for your astute explanation of pressurization.

[@jeffreybaba4155]

Learning new things, Thanks Captain Obet😊

[@frankoburu6903]

Captain Obet , that is the best explanation I have ever understood about cabin pressure and the effects it has on the human breathing system. Keep up the good work. Safe skies

[@petersjeanpaul9071]

What I really love about you beyond all the valuable knowledge you share for free, is your English. As a non-native English speaker I sometimes struggle to understand English speakers, but yours is absolutely delightful and clear 💯✌️

[@pilot_obet]

Thank you Sir.

[@akivatalansky]

Two years ago, I visited Mt. Washington, around 6300 ft above sea level. I have a weather gauge with a barometer, the pressure was 792 millibars at the top. Didn't notice much of a difference in breathing, but I did feel pressure in my ears as we drove down the road from the summit.

[@piretkivi3218]

Thank you, Captain. I finally understand my daytrips to the Pyrenees. I used to go up there when I lived in Barcelona. The beauty was overwhelming but my body reacted with a massive headache. So I always travelled with some aspirin. After arrival I consumed a cup of hot chocolate and swallowed my aspirin. When I got back to Barcelona I always felt tired. I thought because of the beauty of the mountains but it seems those high altitudes did not really agree with my body. They did agree with my soul! So may I recommend a cup of hot chocolate?

[@meister6934]

Fantastic clip Captain Obet , you explain everything so clearly , god speed to you and your crew 👍

[@meganwelling7304]

Thanks for making these content! I’ve been hoping to become a pilot but have no insights about the industry. Your videos help me get a taste of what it’s like to be a pilot. How is the schedule like for a pilot in Cathay? I have family in the UK. Would I be able to visit them when flying long haul flights?

[@cabecadealho1]

Nice video. I really like these kind of videos. Short and well explained. Keep going

[@TheAcousticCitizen]

I wonder if pilots' cardiovascular health is much higher than regular people due to this

[@jorgygorog6482]

Thank you Captain for another one of your very wonderful and informative clips!

[@bunglejoy3645]

So gor anybody with heart issues or asthma is flying a no no same for generally elderly people

[@MSA3568]

Thanks for the Added clarity about Decompression versus De Pressurisation Captain. During a sudden(explosive) de pressurization could you get the bends too or only after you have been deep sea diving and shortly after flew in a pressurized aeroplane. Thanks for using Nairobi as an example. It is quite high..HKJK being at 5320 and neighbouring Wilson Aerodrome at 5,500. Parts of Nairobi are even higher reaching 7000 and even 9000fy on the Ngong Hills. Whilst we need to breath faster to exert the correct oxygen partial pressure to the lungs, the planes also have to fly faster with a higher TAS and consequently higher ground speeds (as do golf balls!). It is why runways at Airports of higher elevation such as Nairobi, Johannesburg and more so Eldoret in Kenya have long runways and especially that these sub equatorial and tropical Airports can also be hot with peak summer touching 30C ! So they are High Density Altitude Airports where Take Off and Landing performance is critical. Certain jets like the Vickers Suoer VC10 Super were designed to operate especially for these type of Airports in the British Empire. I recall seeing in the 70s and 80s flights on 707s from Nairobi on purpose denying passengers boarding to full capacity because of Take off performance limits.

[@pilot_obet]

Very good and nice response/addition to the video chat. Thank you

[@onlykaygee]

Let’s unravel this. It should ideally be called Recompression Chamber. The divers are Recompressing with pure oxygen after suffering Decompression Sickness or The Bends. Indeed what an aircraft passenger would suffer is similar to a Decompression (suffered by person) ‘sickness’ if the aircraft cabin experienced a Depressurisation (suffered by pressurised chamber or vessel) & ONLY if such depressurisation was extremely slow or gradual then ceased. What’s your take? [Or anyone with the relevant experience.] I’m a new fan of your channel & loving your content. I love everything Aviation & have only 17 years experience in the Aviation Industry. All the best!

[@pilot_obet]

Yes indeed- I get your take on it.

[@benpatana7664]

I've always wondered why we feel so tired after a long plane ride (when we are just sitting there eating and watching movies). Obet's explanation about faster breathing makes good sense. That said, take a loing train or bus trip (where altitude is not a factor) and you'll also feel very jaded on arrival. So there is probably more than one factor at work here I think.

[@MSA3568]

Also sitting idle and no circulation exerts requires more BP to circulate..you provide that by involuntary hyperventilation so it gets you feeling fatigued

[@andrewpaul4545]

On coming down/landing, I suffer badly with ear pain/blockage!!!I would be interested to know how pilots deal with this? Or do you become immune to it, as you are doing it all of the time!!! Many thanks!!!

[@pilot_obet]

Best is to swallow regularly or pinch your nostrils and blow.

[@ivoryjohnson4662]

Thank you Captain, I am a diver and your explanation is spot on

[@johnmira1039]

Great video Captain.👍👌

[@frawihe]

Thank you captain for explaining us the Queen of the Skies. Actually I do have a question. Right at the beginning around 0:15 I can see this horizontal marker with a short vertical marker on the window frame. What is it good for? I saw it also in older videos on a 747-300.

[@pilot_obet]

It is used for adjusting seat position. Ill show you soon

[@frawihe]

Later 👍

[@markfosseth8047]

Thx Captain !

[@AVIATIONSOUNDEXPERT]

Hello Captain, Can you explain the upper EICAS message "HF DATA OFF", please?

[@dionysus1701]

Awesome explanations, I learnt quite a bit. Thank you for your time.

[@the_og_shockwv3182]

Very Very Cool chats Cpt Obet, keep it up, this is highly informative!

[@sanjayprakash471]

Thanks chief. Very helpful and informative. Later mate

[@shaunpavery-pn5jq]

Great video.we had a jumbo come in to our airport,and the a p u was broken.got to see a start cart spin the engine up.very loud.😊❤🌍🕊️✈️

[@MEU2k]

Captain please shoot more inflight videos and show the functions that relate to life, like today you mentioned about breathing. Also the other vital aircraft aspects that come to life after it is airborne. Like EGT, fuel temp, wind effects etc

[@thembathemba3354]

thank you for being an inspiration

[@pilot_obet]

My pleasure

[@B747-4OO]

EXCELLENT information!! Thanks for this!! 😎👍

[@stephenfontinelle]

Excellent information as always my good Captain.

[@annapaolagrandini1052]

Nice lesson as usual and thank you Captain for sharing...later!

[@sebinamuwanga]

Thanks, Skipper. The other fact is, that low pressure at high altitudes prevents oxygen from being pushed through the alveoli in the lungs to permit a normal gaseous exchange. Pressurization allows passengers' lungs to perform the normal gaseous exchange. If pressurization is lost at 15,000 feet above sea level, humans can remain conscious for 30 minutes. At 30,000 feet consciousness can only be maintained for 3 minutes while at 50,000 feet, a human being will remain conscious for only 9 seconds. Interestingly, pressurization is not a legal requirement for the operation of aircraft, even the ones that cruise at FL 300 and above. The legal requirement is for pressurized aircraft operating above FL 250, to be equipped with a device to warn the flight crew in the event of loss of pressurization. A sufficient quantity of stored breathing oxygen should be available to passengers and crew, to enable them to breathe during emergency descents to an altitude where the atmospheric pressure permits breathing without the aid of supplemental oxygen. Later!

[@pilot_obet]

Correct

[@MSA3568]

It has more to do with oxygen partial pressure rather than oxygen intake itself

[@sebinamuwanga]

@@MSA3568 Correct!

[@glideslopRM]

Please make a video on how to understand the meaning of land at the nearest suitable airport.

[@locoHAWAIIANkane]

Yet another reason to always travel first class right Captain 😉

[@Tjgraham125]

Very interesting 🤙🤙 🤙thanks for posting

[@mariojunior6489]

Good morning, Captain! Very good!

[@mugundhann5905]

Lovely piece of information captain

[@Е.М-ч8р]

Famous Cpt, Hello) Looks like rainy evening 🤔🙂

[@pilot_obet]

The intro was just done on the ground in Chongqing to go with the main video

[@Е.М-ч8р]

@@pilot_obet keep flying and remove more and more freights🙏❤️ I saw so much videos on channel justplanes and it is very amazing how you concentrate on main things when land or takeoff it's fantastic! 🔥