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We revisit supersymmetric hybrid inflation in the context of flipped $SU(5)$model. With minimal superpotential and minimal K\"ahler potential, and softSUSY masses of order $(1 - 100)$ TeV, compatibility with the Planck data yieldsa symmetry breaking scale $M$ of flipped $SU(5)$ close to $(2 - 4) \times10^{15}$ GeV. This disagrees with the lower limit $M \gtrsim 7 \times 10^{15}$GeV set from proton decay searches by the Super-Kamiokande collaboration. Weshow how $M$ close to the unification scale $2\times 10^{16}$ GeV can bereconciled with SUSY hybrid inflation by employing a non-minimal K\"ahlerpotential. Proton decays into $e^+ \pi^0$ with an estimated lifetime of order$10^{36}$ years. The tensor to scalar ratio $r$ in this case can approachobservable values $\sim 10^{-4} - 10^{-3}$.

Gravity Waves and Proton Decay in Flipped SU(5) Hybrid Inflation Model