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Richard68369
Topic Author
Posts: 2
Joined: Sat Jan 19, 2019 9:46 pm

747-400 question

Sat Jan 19, 2019 10:21 pm

I am new to this site, I have a question about the 747-400 in the attached photo under the G of the registration what is the vent for? I have tried google and looking on here but couldn’t find the answer. Thanks in advance.

https://www.airliners.net/photo/British ... hoWf6Xsy8E
 
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N707PA
Posts: 232
Joined: Sun Apr 09, 2000 11:01 pm

Re: 747-400 question

Sat Jan 19, 2019 11:13 pm

Those are the cabin pressurization outflow valves, they are used to regulate the pressure in the cabin.

http://en.wikipedia.org/wiki/Cabin_pressurization

Image
 
Richard68369
Topic Author
Posts: 2
Joined: Sat Jan 19, 2019 9:46 pm

Re: 747-400 question

Sun Jan 20, 2019 8:26 pm

Thanks that has satisfied a curiosity.
 
welikesam
Posts: 1
Joined: Tue Oct 17, 2017 1:29 am

Re: 747-400 question

Sun Jan 20, 2019 9:45 pm

That's a fester valve control door. It's a run off groove used for pressure control and mitigating dihydrogen monoxide flow
 
WayexTDI
Posts: 1706
Joined: Fri Sep 21, 2018 4:38 pm

Re: 747-400 question

Mon Jan 21, 2019 12:43 am

welikesam wrote:
That's a fester valve control door. It's a run off groove used for pressure control and mitigating dihydrogen monoxide flow

Isn't dihydrogen monoxide H20 a.k.a. water???

And what's a "fester valve"? Yes, I did google it and nothing came back.
 
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Starlionblue
Posts: 19940
Joined: Fri Feb 27, 2004 9:54 pm

Re: 747-400 question

Mon Jan 21, 2019 1:01 am

WayexTDI wrote:
welikesam wrote:
That's a fester valve control door. It's a run off groove used for pressure control and mitigating dihydrogen monoxide flow

Isn't dihydrogen monoxide H20 a.k.a. water???

And what's a "fester valve"? Yes, I did google it and nothing came back.


He is yanking your chain. :D
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
747Whale
Posts: 725
Joined: Fri Dec 07, 2018 7:41 pm

Re: 747-400 question

Mon Jan 21, 2019 1:29 am

 
WayexTDI
Posts: 1706
Joined: Fri Sep 21, 2018 4:38 pm

Re: 747-400 question

Mon Jan 21, 2019 3:28 am

Starlionblue wrote:
WayexTDI wrote:
welikesam wrote:
That's a fester valve control door. It's a run off groove used for pressure control and mitigating dihydrogen monoxide flow

Isn't dihydrogen monoxide H20 a.k.a. water???

And what's a "fester valve"? Yes, I did google it and nothing came back.


He is yanking your chain. :D

So, the guy responds in a demeaning way to a genuine question?

Good to know he's a jerk, he's going straight to my foe list...
 
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Starlionblue
Posts: 19940
Joined: Fri Feb 27, 2004 9:54 pm

Re: 747-400 question

Mon Jan 21, 2019 8:22 am

WayexTDI wrote:
Starlionblue wrote:
WayexTDI wrote:
Isn't dihydrogen monoxide H20 a.k.a. water???

And what's a "fester valve"? Yes, I did google it and nothing came back.


He is yanking your chain. :D

So, the guy responds in a demeaning way to a genuine question?

Good to know he's a jerk, he's going straight to my foe list...


Demeaning...? It was a joke...
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
stratclub
Posts: 1372
Joined: Fri Jan 05, 2018 10:38 pm

Re: 747-400 question

Mon Jan 21, 2019 2:25 pm

I have no clue how Chevy Chase's moronic humor has any thing to to with the OP's question. I have no clue why anything Chevy Chase did was considered funny by anyone. Are there that many morons in the general population?

In a pressure vessel such as an aircraft, air pressure is pumped in and the outflow valves are modulated to maintain cabin pressure. Kind of a controlled leak actually. There are 2 outflow valves just in case one malfunctions.
 
WayexTDI
Posts: 1706
Joined: Fri Sep 21, 2018 4:38 pm

Re: 747-400 question

Mon Jan 21, 2019 2:56 pm

Starlionblue wrote:
WayexTDI wrote:
Starlionblue wrote:

He is yanking your chain. :D

So, the guy responds in a demeaning way to a genuine question?

Good to know he's a jerk, he's going straight to my foe list...


Demeaning...? It was a joke...

Guess we have different definition of what a joke is.
Sorry to say, but for me it was anything but a joke.
 
GalaxyFlyer
Posts: 5664
Joined: Fri Jan 01, 2016 4:44 am

Re: 747-400 question

Mon Jan 21, 2019 3:43 pm

If you cant that for a joke, just wait til you get into aviation. How is that search for 50’ of flight line going?

GF
 
747Whale
Posts: 725
Joined: Fri Dec 07, 2018 7:41 pm

Re: 747-400 question

Mon Jan 21, 2019 3:49 pm

Or the ongoing search for two gallons of jetwash.
 
CplKlinger
Posts: 326
Joined: Sun Oct 03, 2010 3:05 pm

Re: 747-400 question

Mon Jan 21, 2019 4:28 pm

747Whale wrote:
Or the ongoing search for two gallons of jetwash.


Wait, I was told to look for prop wash. You mean there's two kinds of these running around?
 
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Starlionblue
Posts: 19940
Joined: Fri Feb 27, 2004 9:54 pm

Re: 747-400 question

Mon Jan 21, 2019 11:51 pm

GalaxyFlyer wrote:
If you cant that for a joke, just wait til you get into aviation. How is that search for 50’ of flight line going?

GF


Quite. Growing a thick skin is a job requirement.

I'll get back to you on the flight line. It's been 7 years since my instructor asked me for some and I'm still looking!

#musttryharder



CplKlinger wrote:
747Whale wrote:
Or the ongoing search for two gallons of jetwash.


Wait, I was told to look for prop wash. You mean there's two kinds of these running around?


Yes. Jetwash has a green dye added so you can easily tell.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
rivetremover
Posts: 19
Joined: Mon Nov 12, 2018 1:10 pm

Re: 747-400 question

Tue Jan 22, 2019 12:08 am

stratclub wrote:
I have no clue how Chevy Chase's moronic humor has any thing to to with the OP's question. I have no clue why anything Chevy Chase did was considered funny by anyone. Are there that many morons in the general population?


You sound like a fun guy.
 
stratclub
Posts: 1372
Joined: Fri Jan 05, 2018 10:38 pm

Re: 747-400 question

Tue Jan 22, 2019 12:51 am

rivetremover wrote:
stratclub wrote:
I have no clue how Chevy Chase's moronic humor has any thing to to with the OP's question. I have no clue why anything Chevy Chase did was considered funny by anyone. Are there that many morons in the general population?


You sound like a fun guy.

You are correct. When I'm "on" my sense of humor is second to none.

So, you actually think Chevy Chase is funny? Really, really really? Did the Orange One (Trump) declare by Executive Order that Chevy Chase is funny? Maybe you should start a Go Fund me account to buy Chevy Chase a sense of humor.

There is a lot of truth in this movie about where our society is headed. Yup, I know. Because Merica. Chevy Chase would be a comedic genius in this version of the future. https://en.wikipedia.org/wiki/Idiocracy
 
rivetremover
Posts: 19
Joined: Mon Nov 12, 2018 1:10 pm

Re: 747-400 question

Tue Jan 22, 2019 1:27 am

stratclub wrote:
rivetremover wrote:
stratclub wrote:
I have no clue how Chevy Chase's moronic humor has any thing to to with the OP's question. I have no clue why anything Chevy Chase did was considered funny by anyone. Are there that many morons in the general population?


You sound like a fun guy.

You are correct. When I'm "on" my sense of humor is second to none.

So, you actually think Chevy Chase is funny? Really, really really? Did the Orange One (Trump) declare by Executive Order that Chevy Chase is funny? Maybe you should start a Go Fund me account to buy Chevy Chase a sense of humor.

There is a lot of truth in this movie about where our society is headed. Yup, I know. Because Merica. Chevy Chase would be a comedic genius in this version of the future. https://en.wikipedia.org/wiki/Idiocracy


Wow this is actually amazing.

Always a good sign of a comedian when they have to "be on" in order to be funny.
 
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Starlionblue
Posts: 19940
Joined: Fri Feb 27, 2004 9:54 pm

Re: 747-400 question

Tue Jan 22, 2019 1:37 am

stratclub wrote:
rivetremover wrote:
stratclub wrote:
I have no clue how Chevy Chase's moronic humor has any thing to to with the OP's question. I have no clue why anything Chevy Chase did was considered funny by anyone. Are there that many morons in the general population?


You sound like a fun guy.

You are correct. When I'm "on" my sense of humor is second to none.

So, you actually think Chevy Chase is funny? Really, really really? Did the Orange One (Drumpf) declare by Executive Order that Chevy Chase is funny? Maybe you should start a Go Fund me account to buy Chevy Chase a sense of humor.

There is a lot of truth in this movie about where our society is headed. Yup, I know. Because Merica. Chevy Chase would be a comedic genius in this version of the future. https://en.wikipedia.org/wiki/Idiocracy


It's humour. Different people like different kinds of humour, different kinds of music, different kinds of books, different kinds of food. Given Mr. Chase's stellar career in comedy, I think it is safe to conclude that a lot of people do enjoy his style.

I strongly dislike experimental jazz but I don't think the people who enjoy it are morons. They're just different, and that's ok.
Last edited by Starlionblue on Tue Jan 22, 2019 1:42 am, edited 3 times in total.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
stratclub
Posts: 1372
Joined: Fri Jan 05, 2018 10:38 pm

Re: 747-400 question

Tue Jan 22, 2019 1:38 am

Well sure. The thing about good comedy is consistency. If you are a comic it's a matter of sink or swim. If your having a bad night and keep dropping clams, you are not "on" and need to get off the stage. Fortunately, Iv'e always had a day job and have never had to rely on my sense of humor to survive.............Chevy Chase = Clam Bake.
 
rivetremover
Posts: 19
Joined: Mon Nov 12, 2018 1:10 pm

Re: 747-400 question

Tue Jan 22, 2019 1:40 am

stratclub wrote:
Well sure. The thing about good comedy is consistency. If you are a comic it's a matter of sink or swim. If your having a bad night and keep dropping clams, you are not "on" and need to get off the stage. Fortunately, Iv'e always had a day job and have never had to rely on my sense of humor to survive.............Chevy Chase = Clam Bake.


This is great. You sound like a comedy consultant from the 80's.
 
chimborazo
Posts: 308
Joined: Sun Sep 25, 2011 7:51 pm

Re: 747-400 question

Tue Jan 22, 2019 3:19 am

Stratclub... is your real name David Brent?

If so, can you do the dance for us please..?
 
LH707330
Posts: 2317
Joined: Fri Jun 15, 2012 11:27 pm

Re: 747-400 question

Tue Jan 22, 2019 6:56 am

The one on the left is actually to remove dihydrogen oxide and air from the cabin, it operates using cabin pressure while at cruise to propel excesses of the compound out. Informally, it's known as a "drain mast."
 
stratclub
Posts: 1372
Joined: Fri Jan 05, 2018 10:38 pm

Re: 747-400 question

Tue Jan 22, 2019 6:57 am

Sorry to burst your bubble but I am not David Brent. Please tell me about this dance you speak of.

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