Eddie Posted July 21, 2016 Report Share Posted July 21, 2016 I've worked out how to calculate this, but how does it affect the FMC's performance calculations? Quote Link to comment Share on other sites More sharing options...
dr_anthony Posted July 21, 2016 Report Share Posted July 21, 2016 (edited) No way at this moment, all entries on des forecast not affected FMC calc. ISA at sea level + 15 C. It mean, if you have + 25 C at destination (on sea level) - you have + 10 ISA dev. Temperature changes to -1,98 C by every 1000 ft. Edited July 21, 2016 by dr_anthony Quote Link to comment Share on other sites More sharing options...
Eddie Posted July 21, 2016 Author Report Share Posted July 21, 2016 No way at this moment, all entries on des forecast not affected FMC calc. ISA at sea level + 15 C. It mean, if you have + 25 C at destination (on sea level) - you have + 10 ISA dev. Temperature changes to -1,98 C by every 1000 ft. I was entering ISA deviation for the cruising altitude on the PERF INIT page, not on the descent forecast. Quote Link to comment Share on other sites More sharing options...
Litjan Posted July 21, 2016 Report Share Posted July 21, 2016 Different ISA deviations´ effect on performance is not modeled for now - the effect is fairly small (for typical deviations) and X-Plane does not model certain aspects of ISA deviation (like true altitude changing, etc.) Jan 1 Quote Link to comment Share on other sites More sharing options...
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