Vertical speed selected AIRBUS BOEING
Hello, I have a question. Why pilots select manually the vertical speed whereas there is managed mode ? Is it to regulate and follow a descent path or just to respect an ATC constraint ? Indeed the managed mode of an Airbus or Boeing 737 can proceed automatically without human intervention. On videos from the flight deck we can see often the pilot select the Vertical Speed but why ?
I've been looking on the web for days but I don't find any interesting answers.