B777
Hi
Thanks for the explanation.
Two questions just to dissipate any doubt: the red line stays the same cos it is related to centrifugal force and thus to the rotational velocity of the compressor while the amber index changes and it is computed by the EEC. During alternate mode overspeed protection is provided, overboost not if the thrust levers are firewalled, thus the lack of the amber mark.
What is the difference between soft and hard alternate modes?
Many thanks
Baobab