airplanetire
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How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 2:16 am

How do you tell the difference between a 747-100 and a 747-200? Most 747-100s have just those three windows on the side of the upper deck, but some have more like 6 or 7 (whatever it is on most 742s). On most 747-200s, there are something like 6 or 7 windows, but some have just 3 like most 747-100s.
 
Tom_EDDF
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 2:23 am

I guess there is no visual difference between the 741 and 742. By the way, I've never seen a 742 with just 3 windows, and most of the 741s I've been on had also 6 or more upper deck windows.
 
HlywdCatft
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 2:28 am

Don't all the 747s (100s-200s) have the 10 upperdeck windows? Its just that on some they put the window plugs in to look like there were only 3.

I know TWA used to put plugs in their 747-200s so their 747s would look alike
 
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ATA L1011
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 5:19 am

Their is no way you can tell by just looking at it because some 741's have the extended windows and some 742's have the 3 windows. The differences are with Fuel Capacity, and the 742 has a Higher MGTW.
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NG737PSR
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 7:02 am

Take a look at the engines, most have the Pratt and Whitney JT9 series with the cone-like nozzle at the jet exhaust. Hope this may help you.

The windows are not a conclusive indicator.
 
aamd11
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 12:11 pm

The only conclusive evidence is partially the engines. If it has anything other than PW JT9D bangers on it then its a -200 or (one of ten) -100B models.
The only guaranteed evidence is to look at the maintanance book and service records... look up the registration, nothing but that will guarantee identification.
Have fun!
 
fanofjets
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 12:22 pm

The three upperdeck windows was the standard configuration for all 747s (both -100s and -200s) until around 1974, when the ten upperdeck windows became standard (again, on both -100s and -200s).

Most airlines that purchased the earlier airframes opted for the ten-window retrofit that Boeing offered these customers. TWA, however, did exactly the opposite: those 747s built with a ten-window upperdeck were modified to the three-window configuration! All of TWA's 747 were -100 models, most of them factory-fresh -131s, though the airline did fly at least one -136 acquired secondhand from British Airways.
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Mr.BA
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 12:29 pm

I thought the B741's and B742's engines don't make any difference in looks?

alvin
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planelover
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 12:47 pm

Wow! I learn something every day! I allways thought that 741s had 3 windows and 742s had 8-10. Is there any other differences between the two models? I heard somewhere that some 742s had an extended upper deck retrofited later on. Is this true? Then we would have a 742 looking like a 743! This is starting to get confusing!  Smile/happy/getting dizzy
That's what I think.
 
Tom_EDDF
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 6:26 pm

Mr BA, engines don't make the difference between the 741/742 as long as both a/c are equipped with PW engines. But only the 742 was available with alternative engine options, the GE CF6 (LH...) and the RR RB211 (BA...).

 
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VapourTrails
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 8:56 pm

I always thought you could tell from the windows.. obviously not!  Smile

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The Coachman
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 9:11 pm

That KLM B747 is actually a -300 is it not? It has an extended upper-deck. It's not the windows but the length of the upper deck.
M88, 722, 732, 733, 734, 73G, 73H, 742, 743, 744, 752, 762, 763, 772, 773, 77W, 320, 332, 333, 345, 388, DH8, SF3 - want
 
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 10:16 pm

Is it just me or do these 2 P&W- powered 747s have slightly different engine pylons.
I ´m not sure though wether or not this is a clue in telling the 2 variants apart but in this case the 742 has redesigned engine pylons compared to the 741 even if both are powered by P&Ws


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A40-TY
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 11:03 pm

All 747's up to about line number 200 had the 3 window upper deck (100's and 200's). Later on many of these early aircraft were retrofitted to have the 10 window upper deck (as the first class lounge config. was removed for economic reasons). There are still a number of 747's flying with the 3 window upper deck (e.g. Air Atlanta Icelandic, JAL) and many of these are 747-200's.
It is not even possible to identify a dash number with the type of powerplant they have fitted. Nearly all RB211-524D4 powered 747's are series 200's, with the exception of Saudia's lighter weight 747-168's. The CF6 powered 747's are nearly all 200's except for ANA's 747SR-81's.
So in my view the only way to know if a 747 is a 100 or 200 is to consult an aircraft registration database or similar.
I love it when a plan comes together
 
petertenthije
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RE: How To Tell The Difference Between 741 And 742?

Thu Dec 27, 2001 11:58 pm

That KLM plane is a -200. Later they stretched the uppper deck (hence the additional SUD to to type name).
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The Coachman
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RE: How To Tell The Difference Between 741 And 742?

Fri Dec 28, 2001 8:17 am

Ahh....

thank you.
M88, 722, 732, 733, 734, 73G, 73H, 742, 743, 744, 752, 762, 763, 772, 773, 77W, 320, 332, 333, 345, 388, DH8, SF3 - want
 
airplanetire
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RE: How To Tell The Difference Between 741 And 742?

Fri Dec 28, 2001 12:32 pm

Wasn't KLM the only airline to get the SUD modification to their 742s? Do they have any real 743s?
 
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VapourTrails
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RE: Difference Between 741 And 742? -200 (SUD)

Fri Dec 28, 2001 12:42 pm

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Milesdependent
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RE: How To Tell The Difference Between 741 And 742?

Fri Dec 28, 2001 12:45 pm

Airplanetire:

KLM have 3 747-300s.

Air France had the SUD done on a few of their 742s. JAL had it done on 1 or 2 of their 741s.

I'm not aware of any other SUD retrofits out there.

MD

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