Bulva Posted November 1, 2022 Report Posted November 1, 2022 I'm ashamed to admit, but I don't know where to find information about the OAT temperature ??? Of course there is TAT. I searched on FMC sites (like in 737-800) but can't see OAT ... Quote
Hotdawg Posted November 2, 2022 Report Posted November 2, 2022 OAT is SAT "Static air temperature" 1 Quote
Bulva Posted November 2, 2022 Author Report Posted November 2, 2022 Thank you. Is it possible to switch SAT to TAT in hardware, as it is in the "steam gauge" engine instrument version ??? Quote
Hotdawg Posted November 2, 2022 Report Posted November 2, 2022 (edited) It has been awhile since I have flown -400 but your main concern is TAT inflight. 10 degrees TAT or colder and visible moisture inflight is considered icing conditions. On the ground SAT is not accurate unless you have an asperated Rosemount TAT probe. Even then it's better to use current METAR because it's more accurate. The only times pilots really check SAT inflight is during climb or cruise if SAT is below -40 in the clouds you can turn off engine anti-ice and save a little fuel. Edited November 3, 2022 by Hotdawg duplicate text 2 Quote
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