Originally Posted by
Auxtank
Now, why did they do that? Genuinely interested to know.
Surely it wouldn't be a weight consideration. Was it part of certification - keeping it simpler, etc.
When the 767 was originally certified, it was considered a mid range (certainly not intercontinental - this was before ETOPS was envisioned) and there was little difference between the MTOW and the MLW, so it was decided that there was no need for fuel dump capability.
However, the MTOW gradually crept up (eventually over 400k lbs.), while the MLW stayed the same (320k if memory serves, but don't quote me on that). At some point in there the Feds said enough is enough and insisted fuel dump be added. Memory says it was basic on later builds but again don't hold me to that.
I don't know anything about it being removed...