Originally Posted by
vilas
Airline SOPs also partly depend on their situation i.e. general experience level. Pilots have changed CI and then forgot about it. So they don't encourage any tinkering with CI. But sometimes it can be useful. If you want to reach your cruise level quickly CI of zero will achieve that.
I know Easy jet is using CI 0 for the climb phase to climb at VY speed.
But from my experience, I find that climbing with vertical speed works better as in CLB mode the aircraft always pitch up and down to maintain the speed due to wind shift. Kinda annoying especially on heavy A321 at high altitude.