ETOPS,
Fair question!
One of our Trg Capts who did the the course with Boeing enlightened me. Came up during a discussion as to why some excessive speed excursions occur on finals.
Get a bit slow, put a bit of pwr on, flaps retract a bit at same time(unbeknown to you)-speed shoots up. Conversely, get a bit fast, pull a bit of pwr off, flaps go out a bit at same time, speed drops below Vref.
Be nice if they told us this stuff!
Enjoy the K. C. in Brazil
