after quickly reading about the Tu-204 on wiki, I was stunned to learn that the Tupolev Tu-204 supposedly needs no anti-icing system. Unfortunately, I was not able to find any other (helpful) information how Tupolev accomplished this. The wiki source of the information is no help either, so I am wondering if anyone can shed some light on the non-existing wing anti-icing system of the Tu-204.
Source: https://en.wikipedia.org/wiki/Tupolev_Tu-204#TechnologyThe wings and tails are relatively resistant to ice build-up, and as such anti-icing systems are not equipped. Among today's airliners the Tu-204 is the only one which does not require wing anti-icing systems. During the test flight safety has been confirmed without the anti-icing system on the bearing surfaces and the aircraft obtained Russian and European certificates.
Thank you very much for your help.