|Quoting UAL747 (Reply 1):|
You can tell they are -40's because of the MD-11 style No. 2 engine inlet. (Larger).
|Quoting LTU932 (Reply 2):|
And also on JAL's aircraft you can clearly make out a Series 40 from a Series 30 because their JT9Ds have an engine cone similar to the one of the PW4400 Series powered MD-11s...
|Quoting Gigneil (Reply 6):|
Hmm? The center gear is selectable, just like on the A340. You don't have to extend it if your plane is light enough.
|Quoting ImperialEagle (Reply 5):|
The DC-10-20 was redesignated a series 40 by MDD at the request of NW, so as not to appear "numerically inferior" to the series 30's. Although the prototype, N141US, still designated as a series 20 first flew in February of 1972. NW had great plans for this aircraft, especially looking forward to the versatility of its range for Trans-Pacific ops. However like all the other operators, NW suffered its share of teething trouble, and NW's Chief at that time was easily spooked.
|Quoting Flywithjohn (Thread starter):|
I don't know much about the DC-10 but why is NWA using the DC-10-30 instead of the DC-10-40 what is the main difference and why make this switch?
|Quoting Ctbarnes (Reply 15):|
I think age and maintenance costs have something to do with it as well. The airframes were sound and perfectly safe, but try as you might, it's hard to disguise the fact you're flying on a 30 year old aircraft. Passengers hated them because, as one once told the Wall Street Journal, "There always seems to be something broken." whether it be the IFE system, toilets that pack up half way through the flight.
Flight attendants hated them too, because they were the ones who had to deal with the angry passengers when something invariably did break down.
|Quoting Flywithjohn (Reply 20):|
OK I see a lot of reason that is no longer with NW but does any airline at all use the DC-10-40 I know fedex uses -10 -30 but -15 I think there is a -20 and -40 I've never heard of.
|Quoting CIDflyer (Reply 22):|
I believe the D10-40 was phased out when NW began receiving the 753's, in late 2002
|Quoting Magyarorszag (Reply 25):|
If I remember well, when NW got a sufficient number of DC-10-30s for international routes, they kept their DC-10-40s on the US routes.