For the PRC, in its current joint production of the SU-27 with Russia, mainland China will eventually do, at most, only the last 70 % of the production process. The most important initial technology for the aircraft's manufacture, such as the AL-31F engine, has not been transferred by Russia to the PRC; this is because Russia does not want to lose its technological edge over the PRC.
在共軍方面，目前與俄羅斯合作生產的蘇愷二十七型戰機（殲十一），雖為分階段提高自製率，但中共最高只擁有百分之七十的自製率，飛機製造中最重要的技術，如 AL-31F 引擎的製造，俄羅斯基於科技領先的戰略考量，並未轉移給中共。