Takata;
Consequently, variations of measured pressure are assumed to be the cause of cabin regulation issue. My opinion is that those variations are not the result of actual (real) pression difference. All systems that are going off, including this one, are feeded by unreliable informations comming from frozen probes.
For my understanding of your views and given this statement, are you claiming that the static ports were also iced?
HN39, just read from the FCOM, the cabin altitude is limited to 7350' for flights over 2hrs; under 2 hrs it goes to 8000'.
PJ2