L.1011
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747 Differences

Thu Dec 05, 2002 10:06 am

Is there any way to tell the difference between a 741 and a 742?
 
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United_fan
Posts: 6374
Joined: Fri Nov 24, 2000 11:11 am

RE: 747 Differences

Thu Dec 05, 2002 10:15 am

I know 741's have a small hump behind the upper deck. Upper deck window count ins't a very good rule of thumb because some late production 741's had 10-window decks , but some 742's had 5-window decks. It was up to the customer. Maybe someone else know some more ?
Scott in ROC.
Champagne For My Real Friends,and Real Pain For My Sham Friends
 
Guest

RE: 747 Differences

Thu Dec 05, 2002 11:13 am

I am a 747 pilot and I am, myself, unable to recognize 100 from 200s...
xxx
The only reason I can sometimes (not always) say "this is a 100" or "this is a 200" is because what that airline has... and if they have both... problem...
xxx
The only difference is the size of the wheels/tires... THE ONLY DIFFERENCE... and I have been told that some 100s have 200 wheel/tires/brakes... so your guess is as good as mine...
xxx
Be aware that except for the 2 former Sabena 129s, and a dozen of former PanAm 121 CRAF planes, the 100s are not combis (SCD)... early 100s had only 3 windows each side on upper deck (but a few early 200s had 3 as well). Generally the airplanes with LH upper deck door (in addition to RH regular door) are 200s, but some "181SRs" from ANA may have it too, to permit high density seating on the upper deck...
xxx
Real "cargo airplanes" (200F) are the only ones with SCD and nose door... The 100SF and 200SF converted passenger planes to cargo only have SCDs...
xxx
Airplanes with RR engines (look the emblem on cowl) are always 200s, except that Saudia has 12 RR powered 168Bs...
Hope this helps you... probably not, but sorry...
With PanAm, we knew which "tail numbers" were 200s. That was the only way to know for sure...
xxx
Happy contrails -  Smile
(s) Skipper
 
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United_fan
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RE: 747 Differences

Thu Dec 05, 2002 12:12 pm

Here's a pic of a -100. Notice the 'hump' after the Upper deck.

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Photo © Chris Lucak


Here's one of a -200 . Notice the smoothness...

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Photo © Josh Rawlin


Ahhh,but how does one tell the difference between a -200SUD and a -300??
Champagne For My Real Friends,and Real Pain For My Sham Friends
 
WhalePilot
Posts: 91
Joined: Sat Jun 16, 2001 12:28 am

RE: 747 Differences

Thu Dec 05, 2002 12:42 pm

The trailing edge of -100 engine pylons are straight. The -200 Pratt powered pylon trailing edges are curved.
 
WhalePilot
Posts: 91
Joined: Sat Jun 16, 2001 12:28 am

RE: 747 Differences

Thu Dec 05, 2002 12:44 pm

I forgot to add on the above post that -100s have only one nav light on each wing, the -200 has two.
 
JvW
Posts: 171
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RE: 747 Differences

Thu Dec 05, 2002 2:48 pm

I am not quite sure about the hump behind the upper deck...here is the same -100 aircraft some time later without the hump...


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Photo © Torsten Maiwald



JvW

 
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DL_Mech
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RE: 747 Differences

Thu Dec 05, 2002 3:30 pm

The "Hump" is a early Satcom antenna that was later removed on most airplanes. I did see a PIA 747 with it a couple of years ago.......
This plane is built to withstand anything... except a bad pilot.
 
747Specialist
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RE: 747 Differences

Fri Dec 06, 2002 12:05 am

You will find 747-200s with SUD, 747-400s without winglets, 747-100s with 8 windows and 747-200Bs with 3 windows....the only 747 you can be sure you'll recognize is...the SP!
 
boeingnut
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RE: 747 Differences

Fri Dec 06, 2002 12:35 am

If it has both the short upper deck, and RR or GE engines, it is a 742. but there is one exception to this. I think it was Saudia (someone correct me on this if I am wrong, please) that went back and had RR engines fitted to their 741s to replace the PW JT9Ds that came stock on it. I think that Saudia was the only commercial customer for this refit (the USAF did it to their NEACP aircraft, if I remember correctly)
Excuse me, but what does God need with a starship?
 
Guest

RE: 747 Differences

Fri Dec 06, 2002 1:48 pm

Dear Friends -
Do not generalize any of your statements -
Do not think they apply to all planes...
xxx
BoeingNut... Saudia 747-168B were RR powered when ordered...
and ANA has 747-181B(SR) with GE engines... so you see... dont say IT IS...
xxx
Dear Whalepilot - we had 2 nav lights for 100s at PanAm...
xxx
There are so many exceptions - even myself I get lost...
Recognizing 100/200 is IMPOSSIBLE...
xxx
Happy contrails  Wink/being sarcastic
(s) Skipper