Complicated noise generators such as turbomachines can be represented by a geometrically fixed array of localized dipole sources whose distribution when integrated over the surfaces of the machine sum to the net surface dipole contribution to the farfield sound. Experiments were carried out on an off‐the‐shelf axial flow fan wherein blade surface pressures were detected with an embedded miniature pressure transducer, and motor support strut pressure fluctuations with an embedded quarter‐inch microphone. These pressures were cross‐correlated against the farfield sound, with time delay. Both the source and the farfield signals were bandpass filtered at the blade passage frequency of the fan, before being correlated. Results gave information revealing causes of the on‐axis noise radiation from the fan at the blade passage frequency. The contribution of pure‐tone radiation from the struts was compared to that from the fan blades. The effect on the overall sound pressure level of variations in phase of the sources, both on the gtruts and on the blades, was determined. Details of the experimental approach are presented, and the interpretation and usefulness of the data is discussed. [Work supported by Canadian DRB Grant No. 9611‐03.]