ok you guys had a talk with a R/W 737-200 pilot today and asked when and from what refs do you engage Anti/ice.My q was from what ref do you get it (tat) or prog page2 in fmc. A. (tat-) or +15N1. great (tat-) yes but do we use the76 FMC guide as a ref, as the 737-200 as no FMC. (correct me if wrong)do we go by.or do you go off (tat-)for the 76.as prog page 2 will show a temp of such and such.is that at next flight level and w/p or your current pos.It would be just one more answer to getting it right.

As far as I was aware, you go off TAT not SAT as its the TAT that will relate more closely to the temperature of the aeroplane surface where the water will/will not freeze too. As far as I know, Engine Antiice goes on at TAT +10 or less when in visible moisture, and the Wing Antiice when you get visible iceing, which isnt modelled in fs2k2, maybe it will be in 2K4! (we can hope!)CyaIan

Engine anti-ice usually goes off when the SAT goes below -40

Thank you Gent's, for your answers.They give one more step to getting in right.