  We construct an N=1 supersymmetric three-family flipped SU(5) model from type
IIA orientifolds on $T^6/(\Z_2\times \Z_2)$ with D6-branes intersecting at
general angles. The model is constrained by the requirement that Ramond-Ramond
tadpoles cancel, the supersymmetry conditions, and that the gauge boson coupled
to the $U(1)_X$ factor does not get a string-scale mass via a generalised
Green-Schwarz mechanism. The model is further constrained by requiring
cancellation of K-theory charges. The spectrum contains a complete grand
unified and electroweak Higgs sector, however the latter in a non-minimal
number of copies. In addition, it contains extra matter both in bi-fundamental
and vector-like representations as well as two copies of matter in the
symmetric representation of SU(5).
