Lantirn The FlySmart software (which we use as well) does have an option to account for anti ice protection being used both on takeoff and landing. However, there’s no “wing anti ice only” option, since if you have wing AI on, you also have engine AI on (which answers
MarkerInbound ’s question).
Is this the way we’re supposed to apply this penalty when using FS software? I.e.: applying the most restrictive scenario? This would complicate things a bit further, as we fly in mountainous areas with high go around gradients, and the particular aircraft that had that MEL item is an IAE powered aircraft. With weights a bit higher than fairly light, performance becomes an issue. Though we do have EOSIDs for most of these airports, which we could use…
I seem to remember that the FCOM had some performance tables that could be used in this case, and I did find them in previous FCOM versions. But they are removed from the current one…