fuel jettison limit weight

[ElNull]

Any ideas what is fuel jettison limit weight? Is it a limited takeoff weight that assume that we have to dump fuel so we can attain the approach climb limited weight if we're returning to the departure airport?

[Sidestick_n_Rudder]

Fuel jettison limit weight seems to be a fairly new addition - it popped up in the FCOM some ~2 years ago (at least on the 787).

As you guessed, it's a landing climb limited weight plus fuel burned over 30 minutes and fuel jettisoned over 15 minutes. So basically it is a takeoff limiting weight assuming the scenario that you turn back to the departure airport and land after 30 minutes, having dumped fuel for 15 minutes.

I don't know if it is some new certification requirement - haven't found anything in he EASA OPS rules. Perhaps it's somewhere in CS-25. Another thing I don't understand is that Boeing mentions ZFW as a factor here. The tables in the FCOM are based on maximum certified MZFW, however Mr. Boeing says that using lower ZFW may yield less restrictive performance...

EDIT: I have found an exhaustive paper on this new requirement by the FAA (https://www.faa.gov/regulations_policies/rulemaking/committees/documents/media/FTHWG%20Topic%2020%20Return%20Landing%20Recommendation%20Rep ort.pdf)