10 minute Thrust -v- Extended Second Segment

[flybywire380]

Hi All,

Can anyone help with this one please?

For the 737NG, it appears that using 10 minute take-off thrust time limit compared against extended second segment with 5 minutes thrust gives the same limiting performance weight. If this is the case, why would one pay for the 10 minute AFM entry, when you could use extended second segment instead? Could it be to do with the requirement to have 1.2% gradient capability above 400ftAAL?

Thanks in advance.