A/C Packs....

mtsu_av8er · February 22nd, 2004, 14:56

Would any of the big-iron drivers care to bore us with an in-depth explanation of the A/C packs on transport category aircraft, and maybe a web link with some diagrams? Maybe scan some junk out of a manual? Would be appreciated!!!

Mr_Creepy · February 22nd, 2004, 15:25

I'm sure this has been posted in another link. At Midway, PAC stood for Pressurized Air Controller in one manual and Pneumatic Air Cycle Machine in another.

It's basically an advanced air cycle machine.

Here is a site with some pretty good pictures and diagrams:

http://www.b737.org.uk/pneumatics.htm

Minuteman · February 22nd, 2004, 16:02

Let us also not forget the epic "Pressurization ACM" thread in the Tech/Ops forum over at airliners.net. It had a steady body count going for more than two months, with guys scanning pages from maintenance manuals and crawling in the guts of jets with a digital camera.

Education + Entertainment (+plus that site) = Edutainment (at its most awkward moments)

seagull · February 23rd, 2004, 20:12

Packs are a pretty simple concept, really. Air is compressed, and due to compression it gets hotter than it already was. The hot air is put thru a radiator of sorts, where it is cooled by outside air that is moved thru the radiator with fans on the ground or airspeed in flight. This cools the air to a relatively lower temp. The air then goes thru a turbine which decompresses it, and in that process it cools to a lower temp than it started out with. The process is not so much different than a katabatic wind, really.

mtsu_av8er · February 23rd, 2004, 22:53

There we go!!! Thank you much, seagull!!!!

February 22nd, 2004, 14:56	#1
mtsu_av8er Old Skool Join Date: Dec 2002 Location: Utopia Posts: 12,477	A/C Packs.... Would any of the big-iron drivers care to bore us with an in-depth explanation of the A/C packs on transport category aircraft, and maybe a web link with some diagrams? Maybe scan some junk out of a manual? Would be appreciated!!!

February 22nd, 2004, 15:25	#2
Mr_Creepy Old Skool Join Date: May 2003 Location: In the O-zone Posts: 5,807	Re: A/C Packs.... I'm sure this has been posted in another link. At Midway, PAC stood for Pressurized Air Controller in one manual and Pneumatic Air Cycle Machine in another. It's basically an advanced air cycle machine. Here is a site with some pretty good pictures and diagrams: http://www.b737.org.uk/pneumatics.htm

February 22nd, 2004, 16:02	#3
Minuteman Senior Member Join Date: May 2003 Location: Austin, TX Posts: 1,466 Blog Entries: 1	Re: A/C Packs.... Let us also not forget the epic "Pressurization ACM" thread in the Tech/Ops forum over at airliners.net. It had a steady body count going for more than two months, with guys scanning pages from maintenance manuals and crawling in the guts of jets with a digital camera. Education + Entertainment (+plus that site) = Edutainment (at its most awkward moments)

February 23rd, 2004, 20:12	#4
seagull Old Skool Join Date: Sep 2001 Posts: 2,044	Re: A/C Packs.... Packs are a pretty simple concept, really. Air is compressed, and due to compression it gets hotter than it already was. The hot air is put thru a radiator of sorts, where it is cooled by outside air that is moved thru the radiator with fans on the ground or airspeed in flight. This cools the air to a relatively lower temp. The air then goes thru a turbine which decompresses it, and in that process it cools to a lower temp than it started out with. The process is not so much different than a katabatic wind, really.

February 23rd, 2004, 22:53	#5
mtsu_av8er Old Skool Join Date: Dec 2002 Location: Utopia Posts: 12,477	Re: A/C Packs.... There we go!!! Thank you much, seagull!!!!

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