[en] TRIUMF experiment 369,a measurernent of charge symmetry breaking in np elastic scattering at 350 MeV, has completed data taking. Scattering asymmetries were measured with a polarized (unpolarized) neutron beam incident on an unpolarized (polarized) frozen spin target. Coincident scattered neutrons and recoil protons were detected by a mirror symmetric detection system in the centre of mass angle range from 50 degress - 90 degrees. A preliminary result for the difference of the zero-crossing angles, where analyzing powers cross zero, is Δθ_CM = 0.48_± 0.08* (stat.) ± 0.08* (syst.) based on fits over the angle range 55.8 degrees ≤ θcm ≤ 85.4. The differenceof the analyzing powers ΔΑ ≡ Αⁿ - Α^p, where the subscripts denote polarized nucleons, was deduced with dΑ/dθcm = 1.47 x 10^-2 deg ^-1 from phase shift analyses to be [ 71 ± 12 (stat.) ± 12(syst.)] x 10^-4 . It is expected that when all data arc analyzed a statistical accuracy of about 7 x 10^-4 in ΔΑ will be achieved. (author)