How does an aircraft pneumatic pressure controller work?

New Member

Posts: 19

Joined: 3/8/2008

Posted: 1:47:07 PM 7/1/2008

I was told that the controller works to meter the amount of air pressure that is in the cabin to maintain an 8,000 differential between the cabin air and the atmospheric air. This is done by an automatic control (but can be over-ridden) that has outflow valves that keep the right amount of air pressure inside. There are safety outflow valves and and negative1 PSI safety inflow valve in the system. Bleed air from the engines are cooled through the cooling packs and provide the positive pressure for all of this fun.

This is all done to make it more comfortable for the passengers but not allowing too much differential (8.5 PSI max) so you don't stress the airframe.

Is this true?

Full Member

Posts: 130

Joined: 1/26/2008

Posted: 8:07:40 PM 7/1/2008

7 is the answer for sure.

But for serious... you do know this is a forum for ANIMALS?!?! What would make you think that anyone on here would have the slightest clue what you are talking about?!?!? My suggestion is go find a aircraft enthusiasts forum and stop wasting everyones time on this site. That goes for the other crazily off topic post you have.

MaxandAllie

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Posted: 6:56:20 AM 7/3/2008

No silly...that was a true/false question. The answer isn't 7, I think it's true. Do I win the prize???????

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Posted: 12:09:24 PM 8/28/2008

staceyb: But for serious... you do know this is a forum for ANIMALS?!?! What would make you think that anyone on here would have the slightest clue what you are talking about?!?!? My suggestion is go find a aircraft enthusiasts forum and stop wasting everyones time on this site. That goes for the other crazily off topic post you have.

Wow. What a rude comment! And, completely uncalled for. In case you didn't notice, I did post this in the "GENERAL" section. I see all kinds of off topic posts here that have NOTHING to do with animals. Like weddings, ghosts, music, bands, school, weight loss, the NRA, spam, the medieval times, Canada, should I go on? Why should mine be ANY different?

Senior Member

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Posted: 12:45:42 PM 8/28/2008

Interesting question Rico, actually you are right, says my husband.
I agree with you, this is posted under the general section, and as such has every right to be here.
It's actually a small world. My husband trained as an air traffic controller.

Junior Member

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Posted: 1:48:30 PM 8/28/2008

Thank you Pen2 for your response.

I asked this because a buddy and I were talking (he is studying to be an air traffic contoller as well). Anyway, he told me this tidbit of information and I found it to be very interesting. I am seriously considering doing this.

Again, thanks for your kind response.

Most the people here are genuinely warm people. Most of them....

jaboeh02

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Posted: 2:04:29 PM 8/28/2008

I always enjoy new facts of information! Thanks for sharing...quite interesting!!

"The dog has seldom been successful in pulling man
up to his level of sagacity, but man has frequently
dragged the dog down to his."

James Thurber

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Joined: 7/18/2007

Posted: 2:34:03 PM 8/28/2008

If you are seriously thinking of going into this field, I hope that you are aware of the fact that it is one of the most stressful
careers, up there with a dentist. I'm sure your friend will tell you that,in training sessions, on fake screens, they will bombard you with planes coming to and fro, all at different heights, and you have to first of all make sure none of them run into each other, keep some in a holding pattern, whilst allowing some to land, and some to take off.I wish you luck, if you do decide to follow this career. It's an extremely important job being responsible for so many lives.
Good luck.

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Posted: 9:05:25 PM 8/28/2008

Well I am so sorry to have come across as cold Rico. I was just not diggin your really far out topics, but i regress, as yes, you did post in the "general" section. My bad. Go ahead...keep posting your ridiculously off the wall topics and see how many "warm" responses you get. I for one am out.

Oh and just as an aside, most topics under the general section are mundane and light hearted, opinion based posts, not technical jargon that the greater populous has absolutely NO idea about!

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Posted: 12:10:46 PM 9/7/2008

staceyb: Well I am so sorry to have come across as cold Rico. I was just not diggin your really far out topics, but i regress, as yes, you did post in the "general" section. My bad. Go ahead...keep posting your ridiculously off the wall topics and see how many "warm" responses you get. I for one am out.

Oh and just as an aside, most topics under the general section are mundane and light hearted, opinion based posts, not technical jargon that the greater populous has absolutely NO idea about!

I am glad that you are out! Out of what though? Your mind?

It's certainly nice to see that a SENIOR member (Pen2) enjoyed my post. Along with a few others. Thanks Pen.

Technical jargon? No, not really. Just above your head, I guess. What was the point in even responding to my post staceyb? Just to say that you didn't comprehend it? I mean really, you didn't have to hit that 'post reply' button. But, I guess you couldn't help it, huh?

Next time you get confused about a post, here's a hint: DON'T RESPOND TO IT! It's actually pretty easy to the normal folk.

You said this in another post....

"I don't think anyone on this forum goes out of their way to maliciously "trash" anyone else."

Really? Do you really feel that way? Or, were you just kidding? It seems as though YOU went out of YOUR way. Now, didn't you?

You might want to stick to "trashing" the quiet ones.

peaches13185

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Posted: 2:45:19 PM 9/7/2008

Ok, easy there killer. I agree with all the posters on this thread. Your topic is interesting. It's covers one of those things I never knew that I never knew. I did enjoy learning about pneumatic pressure controllers in aircraft. Very interesting topic.

HOWEVER, to me the way you posted it came off as arrogant and self-serving, as if to say "look how smart I am". Then you added the false humility, of "is this correct" as if the average person on this forum would know this type of thing. It felt like you were trying to make the rest of us look stupid or inferior. And the tone of your last post only solidifies this statement.

I think it's great that you want to be an airtraffic controller, but I think you should whatch the tone of your posts if you don't want to draw negative comments. I think it would have read better if you had posted along the line of "I just learned about aircraft pneumatic pressure controllers and thought it was interesting, so I wanted to share it with everyone" instead of asking a question and then answering it yourself.

I like most cats better than I like most people.
I'll try to be nicer if you try to be smarter.

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Joined: 7/18/2007

Posted: 4:28:11 PM 9/7/2008

I just read the original post again post again, and for the life of me, I cannot find any arrogance or self -serving tone in it. To me it sounds like a statement/question, albeit unusual, and not common in everyone's life. No matter how complicated or uncommon the topic, people on the forum have the right to post questions, statements, stories, etc, this is what the general section is for.
I don't think people should get angry, or defensive just because the topic is totally foreign to them. This is the point that you have the option of skipping over that post.
This is just my opinion. I would'nt have known a thing about this topic, if it were not for my husband.

peaches13185

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Posted: 6:00:38 PM 9/7/2008

Giving such a long and detailed statement and then asking "is this true" just seems arrogant and snide to me. But that is just how it came across to me. I don't care enough to be personally offended, and I did think the topic was interesting, but I definately understand stacyb for being annoyed at it.

And again, I think the response to stacyb's comments, however snide her remarks were, had an effect on the perceived tone of the original post.

I'm not saying the OP MEANT to come across that way. I'm just saying that is how I took it, and understand why anyone else would take it that way. I even nicely suggested an improvement.

I'm also not defending stacyb for the attack. She could have voiced her opinion in a gentler way, by all means.

I like most cats better than I like most people.
I'll try to be nicer if you try to be smarter.

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Joined: 3/8/2008

Posted: 3:58:53 PM 9/8/2008

Let me try to clarify this. This is what I originally typed, and HOW it was typed...

I was told that the controller works to meter the amount of air pressure that is in the cabin to maintain an 8,000 differential between the cabin air and the atmospheric air. This is done by an automatic control (but can be over-ridden) that has outflow valves that keep the right amount of air pressure inside. There are safety outflow valves and and negative1 PSI safety inflow valve in the system. Bleed air from the engines are cooled through the cooling packs and provide the positive pressure for all of this fun.

This is all done to make it more comfortable for the passengers but not allowing too much differential (8.5 PSI max) so you don't stress the airframe.

Is this true?

This is how it SHOULD have been typed...

I was told that the controller works to meter the amount of air pressure that is in the cabin. And this is how it was explained...

"....to maintain an 8,000 differential between the cabin air and the atmospheric air. This is done by an automatic control (but can be over-ridden) that has outflow valves that keep the right amount of air pressure inside. There are safety outflow valves and and negative1 PSI safety inflow valve in the system. Bleed air from the engines are cooled through the cooling packs and provide the positive pressure for all of this fun.

This is all done to make it more comfortable for the passengers but not allowing too much differential (8.5 PSI max) so you don't stress the airframe."

Is this true?

The stuff that is in quotes was copied from what my friend had told me (or, typed rather).

I certainly did not mean to come off as arrogant. I did NOT know this information....AT ALL.

Regardless of how I "came off" though, staceyb didn't have to be like that. And, when I came back and read her reply, I was like, "Why not just roll your eyes and scroll on by?" To me, the way she handled this was ARROGANT. The entire post was/is sidetracked. But, we just had to hear her. Ugh. *rolls eyes*

This post started on JULY 1st. I was really new to this forum.

I am glad that a few of you enjoyed the post and found it to be as interesting as I did.

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Posted: 5:31:55 PM 9/8/2008

Regardless of how I "came off" though, staceyb didn't have to be like that. And, when I came back and read her reply, I was like, "Why not just roll your eyes and scroll on by?" To me, the way she handled this was ARROGANT. The entire post was/is sidetracked. But, we just had to hear her. Ugh. *rolls eyes*

You know why I didn't just "roll my eyes and scroll on by"? Because this was only one of a dozen very off topic posts of yours and I was getting very annoyed with reading them. You have been part of TP since March and have posted 24 things on this forum. 16 of which are in the "general" section, having nothing to do with pets. 1 was in the bird section asking about albatross (which by the way are not a pet) 3 are from a topic from 2004 that you reply to for no understandable reason then get offended when a senior member questions you about it. And the ONE post from you that has anything to do with pets is one where you ask about a pug you supposedly found in the woods. Then after receiving replies, you don't say anything at all for a follow up. My original point in posting was that this is a forum to discuss our pets, and yes, as you say there is a general section for off topic discussions, but most members do not do their majority of discussions there. My comment on your post was not arrogant in the least. I enjoy this site tremendously, and I contribute where I can. I see no reason for someone like you hanging around stirring things up. You seem much more interested in causing a commotion than you do in discussing anything to do with pets. That in my books, is a troll. And for some reason you have fallen through the cracks and have gone unnoticed for quite some time. I myself was getting fed up, call that what you will.

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Posted: 10:27:39 AM 9/10/2008

You have been part of TP since March and have posted 24 things on this forum. No, I didn't post a lot. I barely had the time. You see, I was raising my 6 year old nephew that had leukemia who passed away last month.16 of which are in the "general" section, having nothing to do with pets. GENERAL section, NOT pet section. I am new to all this forum stuff. So, I don't know the proper forum etiquette, sue me. 1 was in the bird section asking about albatross (which by the way are not a pet) Albatross. Bird. Not pet bird. 3 are from a topic from 2004 that you reply to for no understandable reason then get offended when a senior member questions you about it. I only remember one of the ones you are talking about, and I went to "search" and looked it up, and responded. Geez. Forgive me. Again, I wasn't aware of the PROPER way to do things as I was new to the whole forum thing. And the ONE post from you that has anything to do with pets is one where you ask about a pug you supposedly found in the woods. Then after receiving replies, you don't say anything at all for a follow up. A lot went on from the time that I posted that, to the time that I came back here. My nephew passing was really hard on me. BTW-I kept the pug. I named him Domino.My original point in posting was that this is a forum to discuss our pets, and yes, as you say there is a general section for off topic discussions, but most members do not do their majority of discussions there. My comment on your post was not arrogant in the least. I enjoy this site tremendously, and I contribute where I can. I see no reason for someone like you hanging around stirring things up. You seem much more interested in causing a commotion than you do in discussing anything to do with pets. That in my books, is a troll. And for some reason you have fallen through the cracks and have gone unnoticed for quite some time. I myself was getting fed up, call that what you will.

I am not a troll. I am a person that also has feelings. I just didn't have the time to be on the computer like a lot of people are. When I joined, I wanted something to take my mind off of the impending funeral I'd soon be arranging. I needed something positive in my life. Something that was warm, and didn't have anything to do with illness. I spent a lot of time reading up on leukemia. I just wanted something different.

So, with that said, please forgive me for 'annoying' you.

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Joined: 1/26/2008

Posted: 11:52:17 AM 9/10/2008

My sincere condolences to your loss. There was no way I could have known the suffering you claim to be going through. Your actions of coming on here after so many months and drudging up this long forgotten post and starting to throw around personal attacks is not the actions of a man looking for something "warm". You too could have very well passed on by and ignored my rude comments, but you chose to attack me and that leaves you open to my retorts as well. To bring up your tragic loss during a heated debate in my opinion is just diverting the point and fishing for sympathy. I am not saying that you do not deserve sympathy for what you have apparently been going through, but you should not use it to win an argument. Start a new post instead, and you will get all the warmth you deserve.

janeryan

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Posts: 59

Joined: 5/21/2008

Posted: 10:21:00 AM 9/11/2008

I haven't been a member for very long, but it surprised me the number of general posts is 3 times the amount of animal posts (even including the medical questions). It shows me that there a great number of members who enjoy discussing non animal topics with other forum members. Regardless of whether I find the topics interesting or not I personally think this makes the site much more colorful, especially because of their diversity.

Rottluvr

Senior Member

Posts: 529

Joined: 3/19/2008

Posted: 6:32:20 PM 9/13/2008

Why would being a dentist be anywhere near as stressfull as an air traffic controller? The air traffic controller is responsible for peoples' lives and equipment worth millions of dollars. Perhaps dentists have such stressful jobs because they charge people hundreds to thousands of dollars for inflicting pain? Something to think about, I guess.