mlglaw
Posts: 51
Joined: Sun Feb 26, 2006 2:30 am

Change Of Model Designation

Tue May 23, 2006 2:38 am

737-100, -200, -300, -400, -500, -600, -700, -800, -900, BBJ, and BBJ-2! When do the changes become significant enough for the plane to have the model number changed; or, is Boeing trying to set a record for the number of 737's manufactured?
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ikramerica
Posts: 13730
Joined: Mon May 23, 2005 9:33 am

RE: Change Of Model Designation

Tue May 23, 2006 2:40 am

737-200Adv, 737-700ER, 737-900ER, 737C (various types)
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Aloha717200
Posts: 3738
Joined: Mon Aug 18, 2003 4:50 am

RE: Change Of Model Designation

Tue May 23, 2006 2:53 am

This post sounds like flamebait, but I'll address it anyway. The changes to an aircraft warrant a new model number when the changes are of a significant nature. "ER" "LR" designations come when boeing (or any other manufacturer) adds extra range/fuel capacity to an existing airframe, without major structural changes. These would be changes that do not alter the overall look of the aircraft very much.

-200, -300, -400 etc desginations come with major structural changes, such as a fuselage stretch or shrink. These would be "visible" changes, as the shape of the aircraft is altered.

Then of course you have your IGW/HGW desgination...where powerplants/wing surfaces etc are altered so as to provide an aircraft with extra payload/range capabilities. Sometimes these are clearly visible changes, sometimes, you have to look harder.

In essence, if the aircraft only receives a new desgination when significant changes are made to it. It has nothing to do with having the most models in the market....it is a response to market demand. Some airlines require a long range 737 for long thin routes....others need a plane with the same capacity, but less range, to cover shorter hops without hurting the bottom line. Boeing does what it can to respond to market demands...but because the two 737s in question here are built for different puposes, both need a distinguishable designation so that the airlines know which to order for their needs.
 
EMBQA
Posts: 7795
Joined: Sat Oct 25, 2003 3:52 am

RE: Change Of Model Designation

Tue May 23, 2006 4:04 am

Some changes can be very suttle. I have personally done a few conversions to Embraer 145's that only required a change to the AFM, but by doing so required a model designation change...which required us to change that data plate.
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