Rapid Depressurisation indications On Boeing 747-400

Good day everyone, how do you do? In this video, I show you what happens when the cabin altitude of an aircraft climbs with a resultant depressurisation of the cabin. First thing to understand is that the aircraft altitude is not the same as the cabin altitude on a pressurised aircraft. In order for occupants inside the aircraft to breathe, the cabin pressure must be maintained to normal levels so passengers and crew can survive. This means the aircraft structure should be strong enough to ‘pressurise’ without exploding as we pump air into the aeroplane as it climbs. We do this by allowing only a measured amount of air to escape as the air gets thinner outside during climb by adjusting outflow valves. Air comes in to cabin via bleed valves and then through the air conditioning packs. So the video is talking ONLY about indications NOT what other actions (Emergency Descent)thereafter- the subject of another video coming soon. Hope you like it- later!✈️✈️✈️✈️😀

[@noahwilliams8918]

These kind of “raw,” lightly-produced videos are my favorite. Seeing how the equipment functions - including what the sim instructor sees - makes it far less intimidating.

[@peterbrown6224]

"Cover your nose and mouth and breathe normally blah blah blah" made me laugh. Your videos are always a treat.

[@pilot_obet7815]

Cheers

[@jordan87lewis]

Thank you Capt for explaining this feature. Appreciate your time and efforts.

[@roppongi765]

Awesome video, as always!! Thank you!

[@MrFabio737]

Thank you very much Captain, greetings from Argentina.

[@pilot_obet7815]

greetings!

[@elenacolon3880]

thank you captain for the video well understood on aircraft pressurisation

[@elenacolon3880]

hi captain : so to get to normal cabin pressure , one would lower the aircraft altitude

[@B747-4OO]

Thanks for another educational video of my favorite plane!! :)

[@pucoka4272]

Thank you Cpt!

[@CaptainJadenAR]

The another great video by our sir

[@volvoripr9980]

If I was to have and instructor I wish it was you Sr.. respect man !!

[@pilot_obet7815]

Thanks to you too.

[@explorelondon3695]

B-HUD still lives on due to the SIM. Thanks for the insight regarding flight management sir, happy flying 🙏. By the way you remind me of one of my lecturers, Mr Washington Mhangami who's also a former pilot/flight engineer..

[@dudleymakeche7842]

Capt. Obert, you seem to talk to your 747-8. This is fascinating. Just love how u do it, my man. Congrats from zambia.

[@pilot_obet7815]

Thank you. Greetings - shani pazambia😊

[@swatz85]

This was one of the biggest problems of flight Japanese 123 when they had an explosive decompression. They forgot to put the mask on the 32 minutes flight until crashing to the mountains, they had no judgment because of hypoxia.

[@stenic2]

I like the way you explain complex things in a easy way, of course it is interesting seeing these contingencies on the simulator, even if I think the noise of air escaping sounds rather silly, of course this must happen also in the real airplane

[@pilot_obet7815]

Thanks

[@diytwoincollege7079]

The hiss noise is an obvious indication that something is wrong. Im suprised that the captain has to drop the masks in the cabin. I would think that it would be automatic on depressurization. What if the pilot is incapacitated by something coming thru the front window? Maybe there are bigger worries in this case.

[@Matteo_Sohn]

i think they drop automatically, the switch in the cockpit is just a verification anyway just in case the automatic drop doesn’t work

[@pilot_obet7815]

The masks will drop automatically at a cabin altitude of 14000 feet. The pilots can do it earlier as I did.

[@simonramseyer147]

once you get the warning does it close the outflow valve automatically and check for control of the valve? I noticed the yellow eicas messages came up on their own .

[@elenacolon3880]

hi captain ; Rapid Depressurisation can also happen if its not set on Auto ?

[@EWormMusic]

Very good video, do you fly cargo or pax?

[@pilot_obet7815]

Now only cargo- all B747 pax are now discontinued

[@reeltrides911S]

Capt do you then descend to an altitude whereby the passengers can breathe normally and then land when able?

[@pilot_obet7815]

Correct!

[@simplyaerospace1266]

Thanks for another amazing video captain. I have a question: I am just starting training for my private pilot’s license, and I need to buy equipment like a headset and EFB. Have you got any recommendations for stores or brands that I should look at? And what should I do in order to be the most successful as possible in aviation? Thank you so much!

[@pilot_obet7815]

well check out Senheiser headsets.

[@simplyaerospace1266]

@@pilot_obet7815 Thank you so much, I'll have a look!

[@HH-mw4sq]

At what point would you pitch the nose down and head for 10,000 feet?

[@pilot_obet7815]

As soon as possible

[@M5150]

Does the simulator simulate windscreen frosting due to rapid depressurization?

[@pilot_obet7815]

Not quite😊

[@petershen1984]

I didn't know that passenger oxygen masks required pilot action to release

[@pilot_obet7815]

They have both- automatic and pilot action. The pilot can pre-empt if they feel the pax should get on to the masks earlier

[@Myst3ryM4nn]

Do Boeings have suction gauges ?

[@HH-mw4sq]

Nope. What do you think they are, Cessna piston-engined singles?

[@kilicsami]

This only applies to people who breathe 😊

[@volvoripr9980]

Lol 😆

[@gabet9283]

Does Cathay pacific hire American pilots?

[@pilot_obet7815]

Yes they do. There are nationalities from all over the world. A lot of American pilots with USA based crew too.

[@grobbelm]

let's hope it never happens later...

[@moboy4779]

You didn't really explain the pilot actions. Put on your mask and put the switch for the passenger masks to on. Tells us very little. How about the emergency decent procedure, FMS actions, dealing with amber alerts on the upper EICAS synoptic etc.... I expected more from you as you are normally very informative. What happened?

[@pilot_obet7815]

As I said in the narrative- this video was just about the indications in the flight deck NIT the pilot actions- this will be the subject of another video

[@moboy4779]

@@pilot_obet7815 Look forward to it.

[@acceptablecasualty5319]

No thank you. I prefer flying with a canary.