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We report a possible dipole anisotropy on acceleration scale $g_{\dag}$ with147 rotationally supported galaxies in local Universe. It is found that amonopole and dipole correction for the radial acceleration relation can betterdescribe the SPARC data set. The monopole term is negligible but the dipolemagnitude is significant. It is also found that the dipole correction is mostlyinduced by the anisotropy on the acceleration scale. The magnitude of$\hat{g}_{\dag}$-dipole reaches up to $0.25\pm0.04$, and its direction isaligned to $(l,b) = (171.30^{\circ}\pm7.18^{\circ},-15.41^{\circ}\pm4.87^{\circ})$, which is very close to the maximum anisotropydirection from the hemisphere comparison method. Furthermore, robust checkshows that the dipole anisotropy couldn't be reproduced by isotropic mock dataset. However, it is still premature to claim that the Universe is anisotropicdue to the small data samples and uncertainty in the current observations.

Searching for a possible dipole anisotropy on acceleration scale with 147 rotationally supported galaxies