Why can't I climb to 40,000 feet when the aircraft ceiling is 42,000 feet

So, I know there is a feature on the a350-900 that is only available when cruising at 42,000 feet. However, when I try to cruise at 38,000 feet (a350-900) on a regular long haul the aircraft begins shaking and eventually stalls. In the end I just cruise at 32,000 feet. I have also tried climbing to 40,000 feet with other aircraft such as the a330, but it stalled at 38,000 feet. Does anyone know why this is happening? Apologies for my stupidity if the answer is very obvious. Thanks.

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Hello!

That would be because you’re too heavy.
You won’t find any long haul flights on any aircraft climbing to it’s service ceiling immediately. They may do that towards the end of the flight, but most certainly not in the beginning :)

You can learn more about that here:

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Thanks, that was massively helpful.

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Schyllberg is the man, if he doesn’t know it it does not exist!!!

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I’m 100% trash on aviation details, but some of the basics i do know :)

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You rock Sir! no sugar coating that one!!

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