  We study the effects of neutrino spin-flip in the magnetic field, B_{AGN}, of
active galactic nuclei (AGN) for high-energy neutrinos (E > 10^{6} GeV)
originating from AGN induced by an interplay of the violation of equivalence
principle parameterized by $\Delta f$ and the twist in B_{AGN}. We point out
that a conversion effect may exist for $\Delta f \sim 10^{-34} (\delta
m^{2}/10^{-5} eV^{2})$ independent of gravity mixing angle. Observational
consequences for this conversion effect are discussed.
