Originally Posted by
captplaystation
Think you will find the non wingleted aircraft at same levels as before, and the bent-wings 2 grand lower, as prev poster said optimum and max for these were a little too close ( never did feel very sensible did it? )
We were told FMC data would show increased optimum altitude performance data for the newer wingletted 757's. Also told that max altitude data would not change.
Did max altitude of the a/c actually improve? Yes. How much? Unknown. The company that produces the winglets did not too the high altitude buffet margin testing to produce higher max altitude data.
FMC shows increased optimum altitude capability. Max altitude is the old, but only, data available.