>takeoff seems to be a time of maximum stress on the engines This is true, 'band A' throttle is used for takeoff and the first minutes of flight. Perhaps a pil

>takeoff seems to be a time of maximum stress on the engines This is true, 'band A' throttle is used for takeoff and the first minutes of flight. Perhaps a pilot could chime in here, but I don't think there's any other non-emergency situation that band A would be used in flight. It's also why jet engines are overhauled on a takeoff schedule. ie some parts have a lifetime of 20,000 cycles (takeoffs/aborted landings)