When I take off in MCT/Flex the thrust percentage is often 70-75% but when I put it in Climb detent it increases to 95-97 percent. Is this normal?

And if it's OK for the engines to run at 97 percent for long periods, why derate so much for take off which is crucial?

The TO perf is from the OIS, the laptop on the left of the captains PFD in the Inibuilds A380. Also seems to take a LOT of runway for takeoff.

Hi,

Yes, it is entirely possible and normal for the A380’s FLX N1 setting to be lower than its Climb N1 setting.

The primary reasons for this distinct performance trait is how Airbus calculates assumed temperatures, how the FADEC treats the air density changes during climbout, and the physics of 4-engine aircraft design.

Hope this helps.

Thanks!