The answer lies somewhere in your FCOM and/or QRH where hopefully you should find a table cunningly labelled “ Go-Around Climb Gradient......”
Originally Posted by
Romfour
Hi everyone,
In the B777 Eng Fail (or shutdown) NNC, at some point the C/L asks to choose between Flaps 20 or Flaps 30 (if perf. permits) for landing.
The obvious answer is: Choose Flaps 30, and if needed for example for G/A climb gradient, use Flaps 20 (with G/A flaps 5).
Broadening the question slightly the fact you use the word "obvious" is interesting, because I guess whether it is obvious to use F30 or not might boil down to local/training department policy
FWIW we approach this question the other way around, so to speak: because of possible issues with performance on a SE Go-Around our "obvious answer" when running that checklist is very much one of "choose Flap 20”, unless there are compelling reasons such as stopping distance to use anything more.
If we
have to use Flap 30 (e.g. contaminated runway, etc) and that compromises climb gradient then the solutions would be the sort of things RubberDogPoo has come up with.