This report describes a wind-tunnel investigation on the interference between a jet and a wing half model, located outside the jet. Pressure distributions on the wing, and lift coefficients calculated from those have been used for evaluation of a method developed at NLR for the prediction of interference effects between jets and parts of airframes. A reduction of lift is found due to the jet below the wing, whereas the jet above the wing induces more lift, sometimes even leading to early separation and stall. Also for comparison with calculated cross sectional jet areas, contours of the jet were estimated at 2 stations behind the nozzle exit.