PrMnO3 is an C-type antiferromagnet, where the Mn sublattice orders into a muMn = (Cx, Fy ,0) magnetic structure below TN = 95.9(3) K. PrFeO3 is a ferromagnet in which the Fe sublattice orders along b-axis below TC = 738(5) K. Recently, based on bulk measurements we have proposed the full magnetic phase diagram of PrMn1-xFexO3 system and found two additional magnetic phases besides PrMnO3 and PrFeO3 magnetic structure. This points out that PrMn1-xFexO3; 0 <= x <=1 system possess rather complicated magnetic phase diagram. Both up to now not known magnetic phases can be determined by one neutron experiment performed on compound chosen from concentration range 0.4 <= x <= 0.5. In order to improve (specify) the magnetic phase diagram of PrMn1-xFexO3 system we propose the neutron powder diffraction experiment on PrMn0.6Fe0.4O3 compound and to accomplish the task we ask for 2 days on E9 difractometer.