Hello allI am flying the CS 727 together with FS Passenger X. Yesterday I was flying from Guatemala City to Panama City. After a certain time (I was at FL210) I realized that all altitude gauges were not working properly. I used the "B" button as I am supposed to. Still, the altitude readings varied suddenly plus/mines 1000 feet or more. Even though I was on level flight.Now I wonder if that could have been induced by FS Passenger (one of the failures that can occur) or if this is anything else. I have done quite some flights with the CS 727 and never had that. What do you think?Thanks for your input!best regardsMerlin

1) were other gauges functioning properly?2) Did you finish the flight normally and see if the FSPax report mentioned it?3) did you hear any cues from the Copilot saying "I think we're having a gauge problem" or something?Basically, if FSPax caused a failure, it would let you know.

Hi CapnjofoThanks for your kind reply.Regarding 1) Other gauges OK--> Yes, everything else was OK - but all the alt gauges where affected - also the copilot ones2) Finish flight to see FSPax report--> No, it was not that funny - had to close the flight3) Audio Cue--> I