Question for a step climb

hey guys i was wondering how i can fly upto FL420 for the B787-9 Dreamliner and then retract flaps without it stalling

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Send a photo?

i dont have one im doing a QF B787-9 fligth to HNL from PER

You can only go up that high when very light.

See this topic - it includes tables which shows appropriate cruise altitudes at certain weights:

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thanks for the help 😁👍it’s a great help mate thanks @BennyBoy_Alpha

Just another suggestion, I would recommend not retracting your flaps at that high of an altitude.

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