dlrk Posted January 8, 2022 Report Share Posted January 8, 2022 (edited) What does "CHECK APT OAT" mean on the FMS? I've entered the OAT in the takeoff and perf pages. Edited January 8, 2022 by SneakyDanish Link to comment Share on other sites More sharing options...
Kikis0507 Posted January 8, 2022 Report Share Posted January 8, 2022 (edited) Hi, this can relate with the “Temperature compensation” setting in the FMS. If you turn this OFF the message will disappear. See the attached screenshot from the Collins FMS manual on this subject. regards frits Edited January 8, 2022 by Kikis0507 Link to comment Share on other sites More sharing options...
dlrk Posted January 8, 2022 Author Report Share Posted January 8, 2022 But I did enter a valid temperature Link to comment Share on other sites More sharing options...
Kikis0507 Posted January 8, 2022 Report Share Posted January 8, 2022 That is correct. But if Temperature Compensation is “ON”, the message will keep appearing. So you need to enter the valid Temp and then have the setting above to “OFF”. Hope this helps. This will most likely only appear in much colder environments Link to comment Share on other sites More sharing options...
dlrk Posted January 8, 2022 Author Report Share Posted January 8, 2022 No, look at the manual you posted "This message is cleared when the temperature compensation is turned off...or when a valid temperature for the airport is entered" Link to comment Share on other sites More sharing options...
dlrk Posted January 8, 2022 Author Report Share Posted January 8, 2022 Solved on discord, the OAT needs to be entered on the TEMP COMP page on page 2 of the index 2 Link to comment Share on other sites More sharing options...
Kikis0507 Posted January 8, 2022 Report Share Posted January 8, 2022 great Link to comment Share on other sites More sharing options...
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