B744 Descent ECON SPD v. SEL SPD - Effect on Descent Logic

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Thanks for the reply, Long Haul.

This would explain the confusion and conflict among eveyone I've asked about this. Some guys insert a descent speed on VNAV 3/3 and some will let it descend in ECON descent speed. So, without even realizing it, by doing that, it changes the logic as to how fast it will go to stay on path (VMO-11 versus FMC command + 15).