COexpress
Topic Author
Posts: 31
Joined: Wed May 30, 2001 12:51 pm

Cabin Pressurization

Thu Mar 20, 2003 5:20 am

Can someone explain to me "in a nutshell" exactly how cabin pressurization is achieved?
 
doug_or
Posts: 3118
Joined: Sat Mar 18, 2000 9:55 am

RE: Cabin Pressurization

Thu Mar 20, 2003 5:23 am

bleed air is taken off the engines somewhere in the compressor section, routed through an a/c unit (not like what you have in yuor window), and dumped into the cabin. holes in the fuesalage called outflow vavles open and close to maintain the correct cabin preasure.
When in doubt, one B pump off
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: Cabin Pressurization

Thu Mar 20, 2003 5:24 am

In 25 words or less,

The aircraft's air-conditioning packs pump air in to pressurize the cabin, and the outflow valve(s) open enough to keep the cabin from over-pressurizing.

ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
cdfmxtech
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Cabin Pressurization

Thu Mar 20, 2003 6:26 am

OPNL

I love how u made "air conditioning" one word to keep withing the 25-word threshold!!!  Big thumbs up
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Cabin Pressurization

Thu Mar 20, 2003 7:13 am

AC packs dont pump air into the cabin.

High pressure air bled from the engines seeks lower pressure, the path the air takes to the cabin is routed through an AC pack.

The AC pack is there to provide cold, warm, and hot air to a temp mixing valve to supply the cabin with for pressurization and temp control.

The AC pack is an air cycle machine as opposed to a vapor cycle machine that uses refrigerant.

JET
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: Cabin Pressurization

Thu Mar 20, 2003 7:24 am

>>>OPNL I love how u made "air conditioning" one word to keep withing the 25-word threshold!!!

We dispatchers have been known to get creative...  Big grin


JETPILOT,

I was just trying to keep it as simple as possible for the gent...
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Cabin Pressurization

Thu Mar 20, 2003 7:30 am

OPNLguy... I was trying to keep it as accurate as possible....

 Big thumbs up

JET
 
OPNLguy
Posts: 11191
Joined: Tue Jun 15, 1999 11:29 am

RE: Cabin Pressurization

Thu Mar 20, 2003 7:32 am

>>>I was trying to keep it as accurate as possible....

Roger that..
ALL views, opinions expressed are mine ONLY and are NOT representative of those shared by Southwest Airlines Co.

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