Abstract: Study on the deposition of jet fuel formed in the engine fuel system was carried out by using JFTOT and HiReTS testers. The test results showed that with the increase of thermal oxidation stability of the jet fuel, the deposits formed during the test were reduced, which indicated that improving the thermal oxidation stability of jet fuel could effectively suppress the deposit formation in the engine fuel system, thus prolonging the service life of engine.

Key words: jet fuel, thermal oxidation stability, deposit