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Cruise max alt and opt alt

Atlas calıskan
in Other

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noticed something that might be a performance calculation issue with the A220.

During my flight, the FMS showed:

  • CRZ ALT: FL360

  • OPT ALT: FL370

  • MAX ALT: FL370

After about 3 hours of flight, the aircraft had burned a significant amount of fuel and become considerably lighter. However, the FMS was still showing exactly the same values: CRZ FL360, OPT FL370, MAX FL370.

I understand that the OPT altitude may remain the same, but shouldn’t the MAX altitude be recalculated as the aircraft gets lighter?

Interestingly, SimBrief was predicting a step climb to FL380 about 150 NM later.

Could this be a bug where the MAX ALT calculation is not updating dynamically with aircraft weight/fuel burn?

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