gilesdavies
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Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 1:34 am

In my eyes a 737-300 and a 737-700 almost look identical and I was wondering if anyone could tell me any of the major charictaristics between the two... (when viewing them at a glance!)

737-700's I know have how started to become common place having winglets, and these have helped lessen the confusion. But now as stated in another thread WN are glueing on winglets on to their 733's and this is not going to help.

Also I know some of the newer 737-700's no longer have the "Eyebrows" above the cockpit windows, but know many of the oldler ones still have them.

I am familiar with airlines like easyJet that painted the ailrons orange on their 737-700's, and could distinguish these between their 737-300 fleet.


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[Edited 2007-02-18 17:35:33]
 
ikramerica
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 1:45 am

18 foot greater wingspan (without winglets), 5 foot taller vertical stabilizer, and the wing is reshaped. When you see them next to each other, you can tell, and even flying in one by the window, you can tell just by looking out at the wing you are not on a NG. But just by looking from the distance, unless you've seen a lot of them and paid close attention, you won't know.

I just flew IAH-LAX and it was scheduled as a 73G but we were on a 733 instead. At the exit row, I could see how much shorter the wing was.
Of all the things to worry about... the Wookie has no pants.
 
Mir
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 1:53 am

The main features I use to tell the difference is the different wingtips of the -700 (more like a flat blade as opposed to the diamond shape of the -300), the lack of the continuation of the engine mount behind the wing in the -700 (this is the dead giveaway), and the way the engine mount doesn't extend over the front of the wing in the -700 the same way as it does in the -300.

Some of these cues aren't always easily visible, so it can indeed be very difficult.

-Mir
7 billion, one nation, imagination...it's a beautiful day
 
Boeing744
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 2:05 am

The way I do it is look at the back tip of the engines. Notice how the -300 just tapers out, but the -700 has a little bit sticking out further.

Lol, I know those were some pretty technical terms I used right there, but that's how I always distinguish Classic from NG.  Wink
 
AirTranTUS
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 3:23 am

Quoting Boeing744 (Reply 3):
The way I do it is look at the back tip of the engines. Notice how the -300 just tapers out, but the -700 has a little bit sticking out further.

Lol, I know those were some pretty technical terms I used right there, but that's how I always distinguish Classic from NG.

Thats a good way to tell. It can be seen clearly on the two EasyJet pictures posted earlier.

The front of the cowling is also larger and more round on the 73G. The 733 is flat on the bottom while the 73G is more round.


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S12PPL
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 3:57 am

The 733 is pretty easy to distinguish from the 73G if you are at the airport. All of the above mentioned ways are great, and I use one other when I'm a pax: The airleron is further inboard on the 73G than the 733, 734, or 735's. And the flaps. Just one look at the flaps either while spotting, or while on board will tell you which type it is.  Smile
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flyboy80
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 8:03 am

If you are spotting you can use the above mentioned techniques, also the landing light configuration is different. Not sure if it was stated before. But the NG's main lights are mounted on the inward wing, and lower fuselage, where on the 300s they are on the inward wing, and outward flap canoe guides. If you are inside one...well, you should know when you walk through the door way, the door face itself is very different (it reminds me more of a 757) and when you enter the cabin, well just look at some pics, and the answer is as plain as day. I used to be based out of PHX, and when I walked past the WN gates I could easily tell which were which out of a row of them. Primarily by just looking at the wing tips in relevance to the ground, and of course the tail, and engines. In addition, the 700 is higher off the ground...its an all around more "beefy" machine.
 
Viscount724
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 8:15 am

Quoting AirTranTUS (Reply 4):
The front of the cowling is also larger and more round on the 73G. The 733 is flat on the bottom while the 73G is more round.

The difference in engine cowlings when viewed from the front, and much taller tail, are the two most obvious differences to me. And if you happen to see an NG 737 next to any earlier 737 and have a front view of the full width of the wingspan, the much greater wingspan is also obvious.

Another difference is the longer main landing gear on the NG series that makes it seem to be sitting slightly higher at the rear than the front, while the -300 has a more level appearance.

There is one other difference if you have a close view of the nose/cockpit section. See Reply 30 in the following thread.

First WN 737-300 With APB Blended Winglets (by Iflyswa Feb 11 2007 in Civil Aviation)#73

[Edited 2007-02-19 00:16:24]

[Edited 2007-02-19 00:17:10]
 
gkirk
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 8:17 am

Quoting AirTranTUS (Reply 4):
Thats a good way to tell. It can be seen clearly on the two EasyJet pictures posted earlier.

The 733 is a great performer, nowt in it's classs. The 73G however,ss ijn a vclass of its own, much like the 757
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JuniorSpotter
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 8:33 am

Here's another easy difference to spot them by...




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Hint: just read. Big grin
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DfwRevolution
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 8:56 am

The eyebrow windows can be removed from a 737-300 too...
 
OV735
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 9:17 am

Quoting JuniorSpotter (Reply 9):

I might be mistaken, but weren't the eyebrows removed several years into 737NG production?


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Starlionblue
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 10:46 am

Quoting OV735 (Reply 11):

I might be mistaken, but weren't the eyebrows removed several years into 737NG production?

Yes. It's not a good characteristic to base spotting on.

If you're sitting by the wing, the trailing edge where the engine sits is very different. On the NG there is no sign of the engine. On the Classic there is this spade like protrusion.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
N231YE
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 11:06 am

The 737NG are missing the wing trailing edge "strut" directly behind the engine exhaust. Also note the flap tract fairings ("canoes") are more "pointed" on the 737-300/400/500:

737-400:
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737-700:
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2H4
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RE: Physical Differences Between 737-300 And 737-7

Mon Feb 19, 2007 11:25 am



Southwest makes it easy. The -300s and -500s have grey flap track fairings:


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....while the -700s have red flap track fairings:


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2H4


Intentionally Left Blank
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:06 pm

A few Exterior Differences would be as follows:-

The -300s have the Pitot Static tubes more Aft of the Radome.The -700s have the Pitot tubes more Fwd.
The -300 Powerplant has a Flat Inlet cowl lower side,unlike the -700.
The -300 is lower Landing gear than the -700
The -300 Wing root Leading edge is not streamlined to the Fuselage like the -700
The -300 TE Flap Transmission fairing is pointed unlike the Square tip on the -700
The -300 has Landing lights on the Outboard TE flap Fairings unlike the -700 where they are located ahead of the pack inlet under the Fuselage.
The -700 Powerplant has a Pointed strut from the Exhaust.

More detailed differences would only be noticable by Mx personnell so no point mentioning them.

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
N231YE
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:14 pm

Quoting 2H4 (Reply 14):
Southwest makes it easy. The -300s and -500s have grey flap track fairings....while the -700s have red flap track fairings:

So, 2H4, do you know why WN does that?  wink 
 
2H4
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RE: Physical Differences Between 737-300 And 737-7

Mon Feb 19, 2007 12:18 pm




Quoting N231YE (Reply 16):
So, 2H4, do you know why WN does that?

To warn ground handlers of the increased wingspan, I believe....


2H4


Intentionally Left Blank
 
N231YE
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:24 pm

Quoting 2H4 (Reply 17):
To warn ground handlers of the increased wingspan, I believe....

Oh well, I wanted to see if you knew that.  mischievous  Maybe I say we start another one of those threads.
 
2H4
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:35 pm




Quoting N231YE (Reply 18):
Oh well, I wanted to see if you knew that.

Here's one for you.....what is the significance of this registration?


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Quoting N231YE (Reply 18):
Maybe I say we start another one of those threads.

Oh, I'm well on my way to building a collection of particularly....ahem..."appropriate" photos for the next competition.

Just you wait...  mischievous 


2H4


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N231YE
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:53 pm

Quoting 2H4 (Reply 19):
Here's one for you.....what is the significance of this registration?

Jim Wimberly...an executive at WN, but not sure what he's good for.

A WN question for you...what brand of spreadable cheese did they serve in their snack packs in 1997?
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 12:59 pm

Quoting 2H4 (Reply 19):
Here's one for you.....what is the significance of this registration?

The number 737.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
2H4
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 1:34 pm




Quoting HAWK21M (Reply 21):
The number 737.



Quoting N231YE (Reply 20):
Jim Wimberly...an executive at WN, but not sure what he's good for.

Both correct, but I was going for Jim Wimberly.....he's particularly good for chili peppers.  yes 

Quoting N231YE (Reply 20):
A WN question for you...what brand of spreadable cheese did they serve in their snack packs in 1997?

Oh man....no idea.

Q: One of Southwest's simulators is painted in one of their special color schemes. In which special color scheme is it painted?


2H4


Intentionally Left Blank
 
MrChips
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 3:53 pm

Quoting 2H4 (Reply 14):
Southwest makes it easy. The -300s and -500s have grey flap track fairings:

....while the -700s have red flap track fairings:


Also, the 737 "Classics" have two canoe fairings for the trailing edge flaps, whereas the 737 NGs have three.

And if you're standing up close to one, the "Classic" main landing gear strut is vertical, whereas the 737NG is angled to the aft of the aircraft.
Time...to un-pimp...ze auto!
 
kbfispotter
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 4:08 pm

Quoting 2H4 (Reply 22):
Q: One of Southwest's simulators is painted in one of their special color schemes. In which special color scheme is it painted?

I could be wrong, but isn't one of them painted in the Shamu colors?

Another way to tell the Classics from the NG: the classics have three slats per wing, while the NGs have four slats per wing...

Kris
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 19, 2007 4:49 pm

Quoting 2H4 (Reply 22):
but I was going for Jim Wimberly

Whose Jim Wimberly.

Quoting KBFIspotter (Reply 24):
Another way to tell the Classics from the NG: the classics have three slats per wing, while the NGs have four slats per wing...

Don't forget No mid TE Flap on the NGs.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
N231YE
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RE: Physical Differences Between 737-300 And 737-700?

Tue Feb 20, 2007 1:14 am

Quoting 2H4 (Reply 22):
Oh man....no idea.

I have no idea either, just wanted to see if you knew (I flew on WN back in 1997, and thought the spreadable cheese was good).  wink 

Quoting 2H4 (Reply 22):
Q: One of Southwest's simulators is painted in one of their special color schemes. In which special color scheme is it painted?

I'll take a stab at the Shamu scheme.

 devil  Uh oh, I think I have started another one of those threads; WN style!
 
JuniorSpotter
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RE: Physical Differences Between 737-300 And 737-700?

Tue Feb 20, 2007 1:51 am

Quoting OV735 (Reply 11):
I might be mistaken, but weren't the eyebrows removed several years into 737NG production?

Well, I was actually just kidding, and my point was to read the series-designation clearly written as "Boeing 737-300" and "Boeing 737-800", on the planes on the pictures I displayed.
If something can go wrong, it will.
 
2H4
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RE: Physical Differences Between 737-300 And 737-700?

Tue Feb 20, 2007 3:09 am




Quoting HAWK21M (Reply 25):
Whose Jim Wimberly.

He was a VP in headquarters.....who I think has retired...

Quoting KBFIspotter (Reply 24):
I could be wrong, but isn't one of them painted in the Shamu colors?

Nope...Lone Star One!  Smile


2H4


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kbfispotter
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RE: Physical Differences Between 737-300 And 737-700?

Tue Feb 20, 2007 4:23 am

Quoting HAWK21M (Reply 25):
Don't forget No mid TE Flap on the NGs.

Actually if you want to be technical about it, they are missing the fore flap from the classics... The new fore flap on the NGs is a heavily redesigned midflap. The flaps are also missing the exhaust gate flap on either side of the pylon extension.

Kris
Proud to be an A&P!!!
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Tue Feb 20, 2007 5:11 pm

The Oleo Servicing point on the MLG is at the Side on the NGs & on the Top of the Strut on the Classics.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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IFixPlanes
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RE: Physical Differences Between 737-300 And 737-7

Tue Feb 20, 2007 5:56 pm

Drawings make some things clearer
never tell an engineer he is wrong ;-)
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Thu Feb 22, 2007 1:48 am

Nice Comparism.Wheres this Sketch from.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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IFixPlanes
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RE: Physical Differences Between 737-300 And 737-700?

Thu Feb 22, 2007 2:54 am

Quoting HAWK21M (Reply 32):
Wheres this Sketch from.

AMM 27-51-00  wink 
never tell an engineer he is wrong ;-)
 
IFIXCF6
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RE: Physical Differences Between 737-300 And 737-700?

Thu Feb 22, 2007 10:40 am

Did I miss it, or did no one mention the APU exhaust on the Classic/Jurassic vs. the APU exhaust + eductor (looks like a second exhaust above the actual one) on the NG's? You can tell them apart from a long distance behind.

Mike
 
phollingsworth
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RE: Physical Differences Between 737-300 And 737-700?

Thu Feb 22, 2007 9:58 pm

Another thing from the pictures in reply 9, though harder to see in many cases, is the location of the pitot tubes. They are farther fwd on the NGs than they are on the classics. This helps as it makes it less likely that the jetway will damage them.
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Sat Feb 24, 2007 9:13 pm

Quoting IFixPlanes (Reply 33):
AMM 27-51-00

Surprisingly Why a comparism Diagram in an NG AMM.

Quoting IFIXCF6 (Reply 34):
Did I miss it, or did no one mention the APU exhaust on the Classic/Jurassic vs. the APU exhaust + eductor (looks like a second exhaust above the actual one) on the NG's? You can tell them apart from a long distance behind



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MEL

[Edited 2007-02-24 13:18:42]
I may not win often, but I damn well never lose!!! ;)
 
ZKNZA
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 26, 2007 12:24 am

As an engineer that has worked extensively on both types I can tell you that the differences between the two a/c are huge.
I sometimes think that the cockpit windows are the only things that havn't changed!
Although the fuselage structure is essentially unchanged every thing else is either different or bigger.
Another easy way to spot NGs is that their engine cowlings, when viewed from the side, are noticably longer.
 
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IFixPlanes
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 26, 2007 3:52 am

Quoting HAWK21M (Reply 36):
Surprisingly Why a comparism Diagram in an NG AMM.

Ever heared of a program like Pain Shop Pro and the use of "print screen" Button Big grin
And the chapter numbering of CL/NG is nearly the same  Wink
Chapter 27 = Flight Control
Section 51 = trailing edge flap
Subject 00 = is used for general description

Sorry, but questions like this let me think about the quality of your licence  Confused
never tell an engineer he is wrong ;-)
 
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HAWK21M
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RE: Physical Differences Between 737-300 And 737-700?

Mon Feb 26, 2007 1:43 pm

Quoting IFixPlanes (Reply 33):
Quoting HAWK21M (Reply 32):
Wheres this Sketch from.
AMM 27-51-00



Quoting IFixPlanes (Reply 38):

Guess you never understood the Question.I've not worked on NGs yet so no access to the AMM.Hence the Question.Your Initial reply stated AMM ref not paint shop hence the doubt why a comparative diagram was present.I did not doubt the ATA chapter numbering.

About the Quality of my licence.This is an Indian DGCA Licence, so Im sure you are aware about its quality & how tough it is to Achieve.There are better Judges around.So relax.You think you are better I have no Problems there.But it does not mean you are Correct.  Smile

Cheers & thanks.


regds
MEL
I may not win often, but I damn well never lose!!! ;)

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