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The DC9 And The MD80's

Mon Jul 30, 2007 5:48 pm

So when I look on different websites it will give MD80's another model number as an DC9 as well. Are these planes the same?

What are the differences or similarites of lets say an MD82 or 83 and an DC9?


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RE: The DC9 And The MD80's

Mon Jul 30, 2007 6:32 pm

When the MD-80 was introduced it was so as the DC-9-80 aka DC-9 Super 80 IIRC the MD-87 and MD-88 were the first ones to receive such designation with the others being DC-9-80/81/82/83 until then. Of course I'm probably wrong, but you never know, I have been known to know a thing or two before.  Smile
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RE: The DC9 And The MD80's

Mon Jul 30, 2007 7:08 pm

Quoting QXatFAT (Thread starter):
So when I look on different websites it will give MD80's another model number as an DC9 as well. Are these planes the same?

For most purposes, yes. A lot of the MD-x are certified as DC-9-x but sold/marketed as MD-x.

The chronology went like this:
DC-9-15 (increased fuel & GW)
DC-9-20 (larger engines and better wing)
DC-9-30 (-20 stretch)
DC-9-40 (-30 stretch)
DC-9-50 (-40 stretch + larger engines)
DC-9-80 (DC-9-50 stretch, post McDonnell Douglas merger), marketed as MD-80
DC-9-81/82/83 (range/weight/thrust increases), marketed as MD-81/82/83
DC-9-87 (shrunk DC-9-82), marketed as MD-87
MD-88 (recertified DC-9-82 with improved flight deck)
MD-90 (stretch + GW + IAE engines)
MD-95 became 717-200 post merger (structurally similar to the DC-9-87 but a complete system overhaul)

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RE: The DC9 And The MD80's

Mon Jul 30, 2007 10:08 pm

The DC-9-80 introduced a 30% larger wing,larger horizontal stabilizer,larger engines,different main gear legs,different flight guidance system,autoland capability and autobrakes,brakes being an option.There were also upgrades to the electrical and hydraulic systems.

Launched in the very late 70's as the DC-9-80,or Super-80,initial versions were the DC-9-81 and the DC-9-82 with uprated engines and higher operating weights.DC-9-83 had even more powerful engines,weights and 1 or 2 auxiliary fuel tanks in the cargo hold for long-range operations.Some airlines upgraded their DC-9-80's with an EFIS cockpit (Scandinavian Airlines did this) and started calling them MD-80's which was the designation McDD was using in their marketing efforts.

The MD-87 was a shorter fuselage version of the MD-82 with a taller "top hat" fin also used on the MD-90 and MD-95.It also had the option of extra fuel tanks.

The MD-88 was the initial factory version with EFIS,later introduced on the production line for the other versions,as well.It also had provisions for mounting propfan engines under development at the time.

The MD-90 did away with the PW engines and had V2500's instead,new electrics,changes to the flight control systems and many,many more minor modifications.Main failure of the MD-90 was it's wing.It was really too small for the added weights of the MD-90,with high altitude performance suffering.

The major difference in the old "classic" DC-9-series,apart from the fuselage lengths,was the introduction of the wider span,slotted wing of the -20/-30/-40/-50 versions.
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RE: The DC9 And The MD80's

Mon Jul 30, 2007 10:46 pm

Avionics were also greatly updated from the DC-9's. To simplify, they are the same frame with different components throughout.
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RE: The DC9 And The MD80's

Mon Jul 30, 2007 10:54 pm

I always think it's so cool on Alitalia, they refer to them as the "Super Ottanta". Sounds very stylish!

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