"Jim Anderson" wrote in message
news

Anyone have the numbers on the empty weight of a "stock" -400 and a
"stock" -400D?

Difficult to do a direct comparison. Here are the figures for a -400
and -400D with GE engines. The -400 assumes a 400 pax configuration and
the -400D assumes 624 pax:

Max Gross T/O Weight: 836,000 600,000
Max Struct. Payload wt: 140,912 134,370
Operating empty weight: 394,088 400,630

Note that the -400D is about 6,500 pounds heavier and this means the same
reduction in payload. Although the D has 224 more seats in this comparison,
it will have fewer galleys and other "monuments". Also note that cycle life
is increased by reducing allowable MGTOW, even though the aircraft is
totally capable of taking off at 836,000 pounds. This is presumably done by
reducing fuel load....if you "do the math" on these numbers, the -400 allows
301,000 pounds of fuel at max payload where the -400D is 65,000 pounds.
This is about 15 hours and 3 hours of fuel, respectively.

Ken Ishiguro