The TRIC-experiment is planned as a novel high-precision test of time-reversal invariance, which conserves  parity. Using the internal circulating polarized proton beam  of the COSY-ring at the Forschungszentrum Jülich and a tensor polarized atomic-beam target, the total cross-section asymmetry A y,xz  is to be measured with an accuracy of 10^-6. In this experiment COSY serves not only as an accelerator but also as a detector and an ideal formed spectrometer.