The rolling bearing 1 of this bearing assembly is of the relubricatable type and is mounted tightly on the shaft 4 by its inner race 2 in such a way as to be prevented from rotating and translating on the shaft, the latter for this purpose comprising a thrust shoulder 3. The outer race 6 of the rolling bearing is housed in a ball swivel with a spherical outer peripheral surface consisting of two half ball swivels 7 back to back and this ball swivel is itself mounted in the spherical housing 8 of a support consisting of two flanges 9, 10 arranged facing one another and slightly separated from one another in the axial direction prior to clamping. One 9 of these flanges may be fixed by lugs 11 to the structure of the craft and the other flange 10 may be fixed to the previous one using screws 12.