When reaching a certain altitude say about 6000ft although happens at other altitudes as well my ias reads zero, ive turned of icing in fsuipc and have deice on in plane any ideas...mark

Hi Mark,OK, deice is on and that is good. Is pitot heat on?(shift/H). Also double check in FSUIPC for all icing options to be off.Hope this helps,JimActiveSky Support

Problem solved, just read up on pitot heat as well..many thanks Jimmark