  In this paper the spacetime of a general boosted Kerr black hole relative to
a Lorentz frame at future null infinity is regarded as a background to examine
its respective Papapetrou fields. Taking into account its sole Killing vector
we evaluate the electric and magnetic components -- in Bondi-Sachs (BS) and
Kerr-Schild (KS) coordinates -- of the Maxwell field which comes from spacetime
isometries. To this end we consider a general timelike observer in KS
coordinates. Satisfying sufficient conditions for horizon and ergosphere
formation it is shown that nonsingular magnetic field configurations are formed
around the boosted Kerr black hole while the electric counterpart vanishes.
Different magnetic field patterns are discussed in the case of variations of
the boost parameter $\gamma$ and direction $\boldsymbol{\hat{n}}$.
