Go Back  PPRuNe Forums > Flight Deck Forums > Tech Log
Reload this Page >

Is there a expensive air decompression system

Tech Log The very best in practical technical discussion on the web

Is there a expensive air decompression system

Old 17th Jul 2022, 14:29
  #1 (permalink)  
Thread Starter
 
Join Date: Jun 2008
Location: Denmark
Age: 55
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Is there a expensive air decompression system

Can companies order a cheep or a better and more expensive air decompression system in commercial aircraft, for example, Airbus / Boeing
I ask because sometimes I experience more pressure for the ears in decent.
The list is long of extra purchases when buying new aircraft, there are many options, but is there a grade of the pressurization system.

Or is "hard" decompression controlled by company rules, pilot related or even manufacture related.

Thanks.
verticallimit is offline  
Old 17th Jul 2022, 19:36
  #2 (permalink)  
 
Join Date: Oct 2019
Location: USA
Posts: 238
Received 0 Likes on 0 Posts
On descent the aircraft interior will start re-compression. If it doesn't then the fuselage can be crushed by outside air pressure. Your eardrums feel the same pressure change and should equalize via the Eustachian tubes. Yawning, or pinching off the nose while slightly exhaling, as scuba divers do when they descend to higher pressure depths, can force air pressure to equalize.

The only technology answer is to build a far stronger fuselage so that the pressure at altitude is closer to the pressure on the ground. Increased pressure increases the stress on the fuselage which can lead to fatigue failures which are avoided by shortening the number of pressurization/depressurization cycles. It's been a concern since the initial designs for Comet aircraft led to crashes.
MechEngr is offline  
Old 17th Jul 2022, 19:58
  #3 (permalink)  
 
Join Date: Apr 2009
Location: Phoenix, AZ
Posts: 220
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by verticallimit View Post
The list is long of extra purchases when buying new aircraft, there are many options, but is there a grade of the pressurization system.
Or is "hard" decompression controlled by company rules, pilot related or even manufacture related.
Not aware of any cabin pressure controller options in any modern aircraft. Control is typical fully automatic with no crew intervention required unless there is a failure. Older aircraft may require a manual setting of the landing altitude.

Cabin pressure will vary between ambient pressure at takeoff, reduce during climb, be stable in cruise, and increase on descent to equal the landing airport ambient pressure. Different aircraft types may have different cruise cabin altitudes (air pressures) for the same aircraft altitude.
EXDAC is online now  
Old 18th Jul 2022, 01:40
  #4 (permalink)  
 
Join Date: Apr 2009
Location: Canada
Posts: 581
Likes: 0
Received 0 Likes on 0 Posts
Try to fly in newer planes with carbon fiber fuselage. They generally are pressurized to a lower Altitude than regular aluminum aircraft as they can withstand higher delta Ps.
Airmann is offline  
Old 30th Jul 2022, 22:32
  #5 (permalink)  
Thread Starter
 
Join Date: Jun 2008
Location: Denmark
Age: 55
Posts: 21
Likes: 0
Received 0 Likes on 0 Posts
Thanks for your answers
verticallimit is offline  
Old 31st Jul 2022, 07:35
  #6 (permalink)  
 
Join Date: Jan 2008
Location: Reading, UK
Posts: 14,407
Likes: 0
Received 3 Likes on 2 Posts
Long gone are the days when the F/As used to hand out boiled sweets.
DaveReidUK is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2022 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.