The Boeing OPT works out whether you can meet a minimum climb gradient (with single engine) as required by the approach chart. This will keep us clear of terrain if the GA is executed per procedures as stipulated in the charts. My question is not really concerning terrain clearance. I just need an idea what the full N1 GA thrust could provide.
Also related to the above, what controls the value of the reduced GA N1 thrust and what %N1 value exactly is this? Unfortunately the Boeing FCOM does not explain any of these...