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The infrared search-and-track sensor housing is turned backwards when not in use and its rear is also treated with RAM.<ref name="stealth patent">{{cite patent |country=RU |number=RU2502643C2 |status=patent |title=Многофункциональный самолет с пониженной радиолокационной заметностью (Multifunctional aircraft with reduced radar signature) |pubdate=27 December 2013 |fdate=30 December 2011 |url=https://findpatent.ru/patent/250/2502643.html}}</ref><ref name="Su-57's stealth features">{{cite web |url=http://www.janes.com/article/32190/pak-fa-stealth-features-patent-published |title=PAK FA stealth features patent published |website=[[Jane's Information Group]] |date=10 January 2014 |access-date=21 July 2018 |archive-url=https://web.archive.org/web/20141023114435/http://www.janes.com/article/32190/pak-fa-stealth-features-patent-published |archive-date=23 October 2014}}</ref> To mask the significant RCS contribution of the engine face, the walls of the inlet ducts are coated with RAM and the partial [[S-duct|serpentine ducts]] obscure most of the engines' compressor face and inlet guide-vanes (IGV); the remaining exposed engine face is masked by a slanted blocker grid placed in front of the IGV at a distance of 0.7—1.2 times the diameter of the duct, similar in principle to the method on the [[Boeing F/A-18E/F Super Hornet|Boeing F/A-18E/F]].<ref name="blocker">{{cite patent |country=RU |number=RU2623031C1 |status=patent |title=Воздухозаборник самолета (Aircraft air intake) |pubdate=2017-06-21 |gdate=2017-06-21 |fdate=2016-06-30 |pridate=2016-06-30 |url=https://patents.google.com/patent/RU2623031C1/ru}}</ref>
The aircraft canopy is coated with 70–90 nm thick metal oxide layers with enhanced radar wave absorbing to
The combined effect of airframe shape and RAM of the production aircraft is estimated to have reduced the aircraft's RCS to a value thirty times smaller than that of the Su-27.<ref name="Butowski, Piotr 2011, p. 34">Butowski, Piotr. "Russian Supercruiser". Air International, February 2011, p. 34. Stamford, UK: Key Publishing.</ref> Sukhoi's patent for the T-50 stealth features cites an intention to reduce average RCS to approximately 0.1 to 1 m<sup>2</sup>, compared to the Su-27's RCS of approximately 10 to 15 m<sup>2</sup>.<ref name="Su-57's stealth features" /><ref>{{Cite patent |country=RU |number=2502643 |title=Многофункциональный самолет с пониженной радиолокационной заметностью (Multifunctional aircraft with reduced radar signature) |url=https://findpatent.ru/patent/250/2502643.html}}</ref> The Su-57's design emphasizes frontal stealth, with RCS-reducing features most apparent in the forward hemisphere; the shaping of the aft fuselage is less optimized for radar stealth compared to American stealth designs such as the F-22 and F-35, likely as a result of cost reduction as well as the Russian doctrine of operating the aircraft within the umbrella of friendly integrated [[air defense system]]s.<ref name="AW_T-50_Innovations" />
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