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xms3200
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747-8i (Pax version) Oxygen System

Mon Feb 08, 2021 5:33 pm

I know the 747-100 to the -400 uses oxygen bottles for the passenger version. Since there are only 3 airlines flying the -8i pax model, does anyone know if they use oxygen generators or bottles....this is strictly for the passenger version....not the freighters.
 
m1m2
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 1:53 am

Are you sure that the 747 uses oxygen bottles for passenger oxygen? While I've never worked on large aircraft, I've never seen anything but oxygen generators on passenger aircraft (well, jet aircraft anyway). I'm not saying you are wrong, I'm just trying to imagine the size of the bottles that would be required to provide 12 minutes of oxygen to that many passengers.
 
PGNCS
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 2:09 am

m1m2 wrote:
Are you sure that the 747 uses oxygen bottles for passenger oxygen?


I only flew the 744, but, yes, it uses O2 bottles.
 
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seat55a
Posts: 249
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 3:02 am

There was the QF30 incident where a bottle (or the valve of a bottle) in the 744 pax O2 system failed catastrophically.

https://en.wikipedia.org/wiki/Qantas_Flight_30
 
m1m2
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 4:41 am

Thank you guys, I learned something today. How many bottles would be there and approx. how big would they be?
 
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seat55a
Posts: 249
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 7:05 am

From ATSB final report on QF30:
Oxygen storage system
The passenger oxygen storage system consisted of 13 high-pressure (12,755 kPa /
1,850 psi) steel cylinders, each with an integral shut-off valve, pressure gauge and
over-pressure protection system (frangible disk). Each cylinder carried a quantity of
oxygen equivalent to 3,256 litres (115 cu.ft) when charged to 12,755 kPa (1,850
psi) at ambient conditions of 1,013 HPa (760 mmHg) and 21 ºC (70 ºF).


https://www.atsb.gov.au/publications/in ... -2008-053/
 
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Starlionblue
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 9:46 am

m1m2 wrote:
Are you sure that the 747 uses oxygen bottles for passenger oxygen? While I've never worked on large aircraft, I've never seen anything but oxygen generators on passenger aircraft (well, jet aircraft anyway). I'm not saying you are wrong, I'm just trying to imagine the size of the bottles that would be required to provide 12 minutes of oxygen to that many passengers.


Ultra-long haul aircraft commonly use gaseous oxygen instead of generators. The 777 has bottles in the cargo hold, and the A350 has little bottles in the individual mask compartments.

Gaseous oxygen becomes pretty much a requirement on certain routes with long stretches of high terrain, for example in Northwestern China, which is a common route from Europe to East Asia. The 15-20 minutes provided by generators are not enough. You need more like 40+ minutes since you might not be able to descend to 10000 feet for a while.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
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747classic
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 4:32 pm

I found the FLIGHT STANDARDIZATION BOARD REPORT of all 747 types (incl 747-8), no changes in oxygen procedures (ATA35) are mentioned.

See : https://fsims.faa.gov/wdocs/fsb/b747-8% ... ev3%20.htm
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
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xms3200
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Re: 747-8i (Pax version) Oxygen System

Tue Feb 09, 2021 6:29 pm

Thank you very much 747 Classic in finding out this information. You have always been a very accurate source of information over the years and it is very much appreciated!!!!
 
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747classic
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Re: 747-8i (Pax version) Oxygen System

Wed Feb 10, 2021 7:27 am

Some trivia : System enhancements at the 747-400ER (and optional at later built 747-400 aircraft ?)
"An electrically activated passenger oxygen system replaces the passenger oxygen system on the 747-400. The new system, which uses many components developed for the 777, is easier to rig and maintain than the system on the 747-400"
See : http://www.boeing.com/commercial/aeroma ... /747ER.pdf.
Operating a twin over the ocean, you're always one engine failure from a total emergency.
 
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Horstroad
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Re: 747-8i (Pax version) Oxygen System

Wed Feb 10, 2021 1:23 pm

The 747-8 has between 7 and and 27 oxygen cylinders. 2-4 for the crew and 5-23 for the passengers. Each cylinder has a capacity of 115 cubic feet of oxygen stored at 1850 psi. They are 9" in diameter, 33.17" long and weigh 21.21 lb

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