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Ken,
The FL200 limit is an operating limitation, so it is not approved or legal to fly higher. The cabin altitude in a P337 is 10,000ft at FL200. I am not sure why they limited the P337 this way. The P210N has the same pressurization setup, but can fly to FL230 where the cabin altitude is 12,100ft or so. The R model P210 is approved to FL250, but you must wear oxygen above FL230. It also shares the same 3.35psi pressurization setup.
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