I am not talking about moving power levers out of notch while PWR MGT in T/O or MCT. Those situations are fully explained in FCOM.
I was wondering if we could move them beyond while flying in CLB/CRS. The reason for that could be as simple as:
- climb to higher level to avoid top of clouds or,
- to reach higher lever quicker to burn less fuel for the whole trip.
I guess the only explainable reason for having power levers in notch position is engine lifetime.