MCDU REC MAX altitude remains static regardless of aircraft weight (A320neo)

Hi team,

I’ve noticed a minor limitation regarding the Airbus MCDU performance calculations in Aerofly FS Global. Currently, no matter what the aircraft's gross weight or payload is (even when fully loaded at MTOW), the REC MAX (Recommended Maximum) altitude on the CRUISE page always stays completely static at FL394. In real-world operations, this value is highly dynamic and depends heavily on current weight and ambient temperature. A heavy aircraft shouldn't be able to achieve or be recommended such a high altitude at the beginning of a flight; the REC MAX should drop significantly and then gradually increase as fuel is burned. Right now, it feels more like a fixed structural ceiling rather than an actual performance indicator. I've attached a screenshot showing the permanent FL394 value. It would be amazing if we could get a more dynamic calculation for OPT and REC MAX altitudes in a future update to make flight planning and step climbs feel more realistic. Thanks for the amazing simulator and constant updates!

Quote from 777Driver

Rec max is just using tables and taking data from the air data computers and gross weight etc. The actual aircraft in the sim will perform correctly, but you have to use the actual tables if you want to calculate your max FL. The FMC is simplified on these aircraft; hopefully, the devs will continue making improvements.

You can get the performance info online for free.

I'm flying at the altitudes provided by Simbrief. I customized the aircraft in Simbrief and entered the loaded weight and empty weight values from Aerofly into Simbrief. According to Simbrief, I cannot reach the altitudes indicated. This is despite reducing the aircraft's fuel according to Simbrief.

Quote from 777Driver

I use Simbreif too. With corrected perf files for the A319, A321, and A350-1000. Can you send me the file, you use for the A320, and your route, etc.? I admit I haven't used the A320, as the CFM version sounds like a Vacuum cleaner in Aerofly.

Thanks

I didn't quite understand you.

Quote from 777Driver

You can extract the file you created for the A320 in simbrief, no worries though. It looks like Jan has answered your question.

Was just curious since I use simbrief with the A319, and haven't had issues with the calculated crz alt. Same with step climbs in the A350.

The only issue I have is that the flight plan uses the real world ISA deviation, which affects aircraft performance. We are stuck with ISA in aerofly

Quote from 777Driver

You can extract the file you created for the A320 in simbrief, no worries though. It looks like Jan has answered your question.

Was just curious since I use simbrief with the A319, and haven't had issues with the calculated crz alt. Same with step climbs in the A350.

The only issue I have is that the flight plan uses the real world ISA deviation, which affects aircraft performance. We are stuck with ISA in aerofly

However, yesterday the altitude indicator showed FL390, while today it shows a maximum of FL370. Yesterday, the maximum altitude the customized aircraft could reach was FL410. I changed it to FL394 today, I don't know if that's why it changed.