airlinereporter
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Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 1:15 am

There was a previous thread (now archived) on A.net talking about AA painting the bellies of the 737 and I wanted to share the answer I was able to get. AA Now Painting Bellies?! (by AA737-823 Nov 13 2011 in Civil Aviation)#menu27

Answer from American:

“All 737’s have fluid discharge ports along the bottom Aft fuselage. AA has decided to paint the underbelly of the aircraft for aesthetic purposes and to prevent any contact of these fluids with the bare aluminum skin.”

Looks like they are being painted to slow down corrosion of the bellies. Not sure if they will be painting their older 737s and still no official word if they are looking at a possible new livery.

David
 
wn700driver
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 1:29 am

Nah, I see right through that excuse. I know what they're really doing. Over time, a little paint here, little more paint there, and next thing you know, Bam!, they have an actual paint scheme. It's livery creep, I tell you!

Thanks for the info. I thought it was something like that, but it's nice to see confirmation. I think there are five or six so-painted 738s now...
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catiii
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 1:34 am

Quoting wn700driver (Reply 1):
Nah, I see right through that excuse.

Agreed. A likely excuse. We all know it's to prevent those vain rampers from wasting time staring at their reflections in the fuselage.
 
N766UA
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 1:51 am

Interesting! I saw one of these 738s at DCA the other day, spent like 45 seconds staring at it thinking I was imagining it. Thanks for posting!
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Newark727
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 1:56 am

Quoting AirlineReporter (Thread starter):
Not sure if they will be painting their older 737s and still no official word if they are looking at a possible new livery.

I think they might be. I saw N934AN on Tuesday with partial belly paint and that one is older.
 
Byrdluvs747
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 6:35 am

this seems like a design flaw to me. Why would Boeing put a discharge port any place but at the very rear of the aircraft to prevent fluid from coming in contact with other parts of the fuselage? Is static electricity discharge a concern at that point?
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yeelep
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 12:40 pm

If it is a design flaw, its one that is shared with pretty much all commercial aircraft. Weight and unnecessary complication are two reasons to have the drains where they are. That said, the 737-800/900 does have a problem with the lav blower vent discharging organic matter.
 
5MillionMiler
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 2:53 pm

Stains impact liveries... Qantas had to paint all RR engines grey because the oil seapage made the white nacelles look filthy
 
T5towbar
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 3:36 pm

Quoting AirlineReporter (Thread starter):
Looks like they are being painted to slow down corrosion of the bellies. Not sure if they will be painting their older 737s and still no official word if they are looking at a possible new livery

What older 737's? Their 737's are fairly recent.
That is true about the venting of fluids on the 737's. There is condensation, you know.
It makes sense to paint underneath to solve that problem. The rest of the plane is still AA.
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airlinereporter
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 4:52 pm

Quoting T5towbar (Reply 8):
What older 737's? Their 737's are fairly recent

I was using "older" as a comparison. Yes, all their 737s are relatively new, but the ones they have already taken delivery previously still do not have the painted underside -- and in fact they are older than the ones with the painted bellies.
 
roseflyer
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 5:30 pm

Quoting Byrdluvs747 (Reply 5):
this seems like a design flaw to me. Why would Boeing put a discharge port any place but at the very rear of the aircraft to prevent fluid from coming in contact with other parts of the fuselage? Is static electricity discharge a concern at that point?

Piping it back to tail would add a lot of weight. Quite a bit of fluid can be discharged in flight. Fuel, hydraulic fluid, and grey water all have drain masts. They are on the bottom of the airplane and are designed so that the fluid does not contact the fuselage. Hydraulic fluid (skydrol) will damage paint as well. Rarely does it vent overboard in flight, but sometimes there are reasons for it to. The drain mast for the hydraulic fluid is just aft of the wheel well on the left side of the airplane.
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DfwRevolution
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 5:32 pm

Beat by RoseFlyer  Wink

[Edited 2011-12-09 09:34:15]
 
D L X
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 5:42 pm

Quoting wn700driver (Reply 1):
Nah, I see right through that excuse. I know what they're really doing. Over time, a little paint here, little more paint there, and next thing you know, Bam!, they have an actual paint scheme. It's livery creep, I tell you!

Over time, a little paint here, little more paint there, and next thing you know, Bam!

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CO777DAL
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 7:34 pm

Quoting AirlineReporter (Thread starter):
Answer from American:

“All 737’s have fluid discharge ports along the bottom Aft fuselage. AA has decided to paint the underbelly of the aircraft for aesthetic purposes and to prevent any contact of these fluids with the bare aluminum skin.”

Looks like they are being painted to slow down corrosion of the bellies. Not sure if they will be painting their older 737s and still no official word if they are looking at a possible new livery.

Yet, CO purposely leave their bellies bare, and they fly a lot more 737s. Like I said on the other thread something isn't right, if AA and CO are doing the exact opposite.
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gdg9
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 7:49 pm

Quoting 5MillionMiler (Reply 7):
Stains impact liveries... Qantas had to paint all RR engines grey because the oil seapage made the white nacelles look filthy

So how do Air France aircraft get more seapage than any other carrier?      
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QualityDr
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RE: Answer To Why AA Is Painting 737 Bellies

Fri Dec 09, 2011 10:52 pm

Quoting gdg9 (Reply 14):
So how do Air France aircraft get more seapage than any other carrier?

You ever had their Clams Provençal?    That'll put a load on the ol' lav...
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