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Physical Differences Between 737-300 And 737-700?  
User currently offlineGilesdavies From United Kingdom, joined Dec 2003, 3014 posts, RR: 2
Posted (7 years 6 months 1 week 6 days 21 hours ago) and read 21801 times:

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]

39 replies: All unread, showing first 25:
 
User currently offlineIkramerica From United States of America, joined May 2005, 21511 posts, RR: 60
Reply 1, posted (7 years 6 months 1 week 6 days 21 hours ago) and read 21796 times:

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.
User currently offlineMir From United States of America, joined Jan 2004, 21571 posts, RR: 55
Reply 2, posted (7 years 6 months 1 week 6 days 21 hours ago) and read 21768 times:

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
User currently offlineBoeing744 From Canada, joined Jun 2005, 1833 posts, RR: 23
Reply 3, posted (7 years 6 months 1 week 6 days 20 hours ago) and read 21729 times:

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


User currently offlineAirTranTUS From , joined Dec 1969, posts, RR:
Reply 4, posted (7 years 6 months 1 week 6 days 19 hours ago) and read 21595 times:

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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User currently offlineS12PPL From , joined Dec 1969, posts, RR:
Reply 5, posted (7 years 6 months 1 week 6 days 19 hours ago) and read 21541 times:

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

User currently offlineFlyboy80 From United States of America, joined Jul 2001, 1878 posts, RR: 3
Reply 6, posted (7 years 6 months 1 week 6 days 14 hours ago) and read 21301 times:

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.

User currently offlineViscount724 From Switzerland, joined Oct 2006, 25170 posts, RR: 22
Reply 7, posted (7 years 6 months 1 week 6 days 14 hours ago) and read 21291 times:

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]

User currently offlineGkirk From UK - Scotland, joined Jun 2000, 24928 posts, RR: 56
Reply 8, posted (7 years 6 months 1 week 6 days 14 hours ago) and read 21273 times:

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



When you hear the noise of the Tartan Army Boys, we'll be coming down the road!
User currently offlineJuniorSpotter From Sweden, joined Mar 2004, 225 posts, RR: 2
Reply 9, posted (7 years 6 months 1 week 6 days 14 hours ago) and read 21235 times:

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




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Hint: just read. Big grin



If something can go wrong, it will.
User currently offlineDfwRevolution From United States of America, joined Jan 2010, 970 posts, RR: 51
Reply 10, posted (7 years 6 months 1 week 6 days 14 hours ago) and read 21159 times:

The eyebrow windows can be removed from a 737-300 too...

User currently offlineOV735 From Estonia, joined Jan 2004, 909 posts, RR: 3
Reply 11, posted (7 years 6 months 1 week 6 days 13 hours ago) and read 21115 times:

Quoting JuniorSpotter (Reply 9):

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


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User currently offlineStarlionblue From Greenland, joined Feb 2004, 17030 posts, RR: 67
Reply 12, posted (7 years 6 months 1 week 6 days 12 hours ago) and read 21034 times:

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."
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 13, posted (7 years 6 months 1 week 6 days 11 hours ago) and read 21024 times:

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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User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 14, posted (7 years 6 months 1 week 6 days 11 hours ago) and read 21019 times:
AIRLINERS.NET CREW
DATABASE EDITOR



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
User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 15, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20989 times:

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



Think of the brighter side!
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 16, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20985 times:

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 


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 17, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20988 times:
AIRLINERS.NET CREW
DATABASE EDITOR




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
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 18, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20978 times:

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.


User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 19, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20976 times:
AIRLINERS.NET CREW
DATABASE EDITOR




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





Intentionally Left Blank
User currently offlineN231YE From , joined Dec 1969, posts, RR:
Reply 20, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20968 times:

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?


User currently offlineHAWK21M From India, joined Jan 2001, 31679 posts, RR: 56
Reply 21, posted (7 years 6 months 1 week 6 days 10 hours ago) and read 20965 times:

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

The number 737.
regds
MEL



Think of the brighter side!
User currently offline2H4 From United States of America, joined Oct 2004, 8955 posts, RR: 60
Reply 22, posted (7 years 6 months 1 week 6 days 9 hours ago) and read 20942 times:
AIRLINERS.NET CREW
DATABASE EDITOR




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
User currently offlineMrChips From Canada, joined Mar 2005, 927 posts, RR: 0
Reply 23, posted (7 years 6 months 1 week 6 days 7 hours ago) and read 20908 times:

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!
User currently offlineKBFIspotter From United States of America, joined May 2005, 729 posts, RR: 1
Reply 24, posted (7 years 6 months 1 week 6 days 6 hours ago) and read 20903 times:

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



Proud to be an A&P!!!
25 HAWK21M : Whose Jim Wimberly. Don't forget No mid TE Flap on the NGs. regds MEL
26 Post contains images N231YE : 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). I'll take a stab at th
27 JuniorSpotter : 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 p
28 Post contains images 2H4 : He was a VP in headquarters.....who I think has retired... Nope...Lone Star One! 2H4
29 KBFIspotter : 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 redesign
30 HAWK21M : 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
31 Post contains links and images IFixPlanes : Drawings make some things clearer
32 HAWK21M : Nice Comparism.Wheres this Sketch from. regds MEL
33 Post contains images IFixPlanes : AMM 27-51-00
34 IFIXCF6 : 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 actu
35 Phollingsworth : 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 th
36 Post contains links and images HAWK21M : Surprisingly Why a comparism Diagram in an NG AMM. View Large View MediumPhoto © 737doctor View Large View MediumPhoto © Dan Brownlee regds
37 ZKNZA : 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
38 Post contains images IFixPlanes : Ever heared of a program like Pain Shop Pro and the use of "print screen" Button And the chapter numbering of CL/NG is nearly the same Chapter 27 = F
39 Post contains images HAWK21M : 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 p
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