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Thread: 773/77W - What's the difference?
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Old Aug 11, 2011 | 11:10 am
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B747-437B
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Originally Posted by EK433B77W
With the 'increase' in specification comes more range (hence the 'ER') and an increase in the M.T.OW. B77W = 351mt, B773 = 299mt.
Certainly, but the GE90 can also be used on the 773A. I don't believe anyone exercised that option however - all 773As seem to be only PW4000 and Trents.

Let's also not forget the marginally longer wingspan due to the raked wingtips on the 77W either.
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