2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/35935An attempt is made to supplement Carter's partial investigation of the global structure of Kerr-Newman spacetime on the symmetry axis. Namely, the global structure of θ= const. timelike submanifolds of Kerr-Newman metric starting from the symmetry axis all the way down to the equatorial plane are studied by introducing a new time coordinate slightly different from the usual Boyer-Lindquist time coordinate. It turns out that the maximal anaytic extension of θ= θ_0 (0 \leq θ_0 < π/2) submanifolds is the same as that of the symmetry axis first studied by Carter whereas θ= π/2 equatorial plane has the topology identical to that of the Reissner-Nordstrom spacetime. General applicability of this method to Kerr-Newman-type black hole solutions in other gravity theories is discussed as well.18 pages, RevtexGeneral Relativity and Quantum CosmologyHigh Energy Physics - Theorytext