We present the results of observations of XTE J0421+560 X-ray transient with Rossi X-ray Timing Explorer in the beginning of April 1998. Lightcurve, obtained by ASM all-sky monitor, shows unusually fast decrease in the objects luminosity. Spectra from series of observations by PCA and HEXTE experiments were studied in detail. Two emission line regions with energies around 6.5 keV and around 8 keV have been mentioned in the spectra. The possibility of generation of the observed emission in relativistic plasma jet has been discussed. Some analogy is found with known Galactic jet source SS433.
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