quickmover
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Any Differences Between WN 737-300 And 737-700?

Tue Sep 21, 2010 3:25 am

Just curious. Are there any performance differences between Southwests 300s and 700s? I know they wanted the cockpit to similar. Are they the same engines? Isn't the wing on the 700 different from the 300?
 
sevenheavy
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RE: Any Differences Between WN 737-300 And 737-700?

Tue Sep 21, 2010 3:58 am

Umm, yes! They are totally different aircraft. Southwest do have an analogue style cockpit layout but its built around a glass cockpit with screens rather than actual analogue gauges.

The aircraft are related but the -700 and -300 are a generation apart. The -700 has new engines, wing, landing gear, structural and aerodynamic components as well as myriad cabin and interior updates. Thats very general - I'm sure someone else will chime in with more detail.

The outcome? more range, payload, reliability, maintainence cost reductions and better passenger comfort.
So long 701, it was nice knowing you.
 
tdscanuck
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RE: Any Differences Between WN 737-300 And 737-700?

Tue Sep 21, 2010 4:01 am

Quoting quickmover (Thread starter):
Are there any performance differences between Southwests 300s and 700s?

Yes, quite a lot.

Quoting quickmover (Thread starter):
I know they wanted the cockpit to similar.

They're the same to the flight crew...the same switches/knobs/displays in the same place to the same thing with the same procedures. The actual hardware and wiring can be radically different for some of the systems.

Quoting quickmover (Thread starter):
Are they the same engines?

No. The -300 uses a CFM56-3 and the -700 uses a CFM56-7.

Quoting quickmover (Thread starter):
Isn't the wing on the 700 different from the 300?

Yes. Complete redesign.

Tom.
 
MD11Engineer
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RE: Any Differences Between WN 737-300 And 737-700?

Tue Sep 21, 2010 8:42 pm

Where do I get started?
Different engines, different landing gear, different wing, different flaps, different hydraulic systems, different electrical systems, different aircon systems, different cabin pressurisation system, different APU, different toilet system, different landing lights, different avionics, different avionic bay layout, different overwing exits, etc.

Jan

[Edited 2010-09-21 13:48:02]
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soon7x7
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RE: Any Differences Between WN 737-300 And 737-700?

Wed Sep 22, 2010 2:37 am

The only similarity is the nosebowl and even at that they added vortex generators.
 
tdscanuck
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RE: Any Differences Between WN 737-300 And 737-700?

Wed Sep 22, 2010 3:39 am

Quoting soon7x7 (Reply 4):
The only similarity is the nosebowl and even at that they added vortex generators.

Although I frequently go on a soapbox about how the 737NG really isn't the same plane as the original 737, it's a little more similar than I think you're implying.

The fuselage mold lines are basically identical. There are some common part numbers. The systems architecture is largely the same, although almost all the individual parts are different.

That said, the 737NG is about as different from the 737CL as it's possible for two aircraft to be and share the same type.

Tom.
 
mandala499
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RE: Any Differences Between WN 737-300 And 737-700?

Wed Sep 22, 2010 6:27 am

The wing and engines = different performance, even at equal weights. It may be similar, but different. And they are trained to cover such differences.

Quoting SevenHeavy (Reply 1):
The -700 has new engines, wing, landing gear, structural and aerodynamic components as well as myriad cabin and interior updates. Thats very general - I'm sure someone else will chime in with more detail.

One major one (benign on day to day, but bloody useful!) is that you can now start the APU in flight if GEN2 goes offline in the air when you have a flat battery (by some poor luck)... no such luck on the classics...

Mandala499
When losing situational awareness, pray Cumulus Granitus isn't nearby !
 
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HAWK21M
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RE: Any Differences Between WN 737-300 And 737-700?

Wed Sep 22, 2010 8:39 am

Quoting MD11Engineer (Reply 3):
different toilet system,

Is that difference in the Principle of operation or Units installed.I believe in the principle,Heard both Vaccuum & Recirculating types are customer options.

regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
MD11Engineer
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RE: Any Differences Between WN 737-300 And 737-700?

Thu Sep 23, 2010 3:53 am

Quoting HAWK21M (Reply 7):
Quoting MD11Engineer (Reply 3):
different toilet system,

Is that difference in the Principle of operation or Units installed.I believe in the principle,Heard both Vaccuum & Recirculating types are customer options.

regds
MEL.

All 737NGs I´ve been working on or flying on (from different airlines) had vacuum toilets. The old "outhouse style" bog might still be an option, but I think that there is rarely anybody using it.

Jan
Je Suis Charlie et je suis Ahmet aussi
 
Mender
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RE: Any Differences Between WN 737-300 And 737-700?

Thu Sep 23, 2010 8:58 am

Quoting tdscanuck (Reply 5):
That said, the 737NG is about as different from the 737CL as it's possible for two aircraft to be and share the same type.

Even the way the fuselage skins overlap each other is different. I suspect that is because the classics were prone to corrosion of the lap joints.
 
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HAWK21M
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RE: Any Differences Between WN 737-300 And 737-700?

Sun Sep 26, 2010 12:04 pm

Quoting MD11Engineer (Reply 8):
The old "outhouse style" bog might still be an option, but I think that there is rarely anybody using it.

Corrosion due leakage is an issue in the Recycling type.
regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
soon7x7
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RE: Any Differences Between WN 737-300 And 737-700?

Sun Sep 26, 2010 12:29 pm

Quoting Mender (Reply 9):
Even the way the fuselage skins overlap each other is different. I suspect that is because the classics were prone to corrosion of the lap joints.


While the pressure vessel has the same cross section, as you have stated, the lap joint locations are different.

Quoting tdscanuck (Reply 5):
it's a little more similar than I think you're implying.


The differences I can see is the new architecture of the wings, H/stab, V/stab, taller landing gears, different power plants, canoe fairings, fuselage lap joints, new glass cockpits, wing to fuselage fairings, emergency exit operations,and many other ancillary interior system changes...IMO, the NG has had quite an extensive redesign. Even while flying as a passenger, you can feel the difference. ...While still being a 737, not much was untouched 'cepting...like I said, the nose appears to be exactly the same only w/ vortex generators...I wouldn't be surprised if the nose bowl from a 727 would still fit on a NG 737.
 
mrskyguy
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RE: Any Differences Between WN 737-300 And 737-700?

Mon Sep 27, 2010 5:04 am

One item that seems to be often overlooked in 733 vs. 7NG comparisons (which was touched upon in bullet-type fashion above) is the cabin pressurization system. The largest difference between the two from a cockpit perspective is the manual vs. automatic panel, but I've never really spent the time to learn more about what is different from a PAX comfort perspective.

What is different about the pressurization system on the -300 vs. the -7NGs that is more comfortable on the later model to passengers? As a very frequent passenger, I haven't noticed anything appreciably different between the two.
"The strength of the turbulence is directly proportional to the temperature of your coffee." -- Gunter's 2nd Law of Air
 
barney captain
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RE: Any Differences Between WN 737-300 And 737-700?

Thu Sep 30, 2010 4:07 pm

Quoting SevenHeavy (Reply 1):
Southwest do have an analogue style cockpit layout but its built around a glass cockpit with screens rather than actual analogue gauges.

All of our NG's are now using the PFD/ND dispays.
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