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Sparticle production and detection at HERA are studied within the recentlyproposed no-scale flipped $SU(5)$ supergravity model. Among the variousreaction channels that could lead to sparticle production at HERA, only thefollowing are within its limit of sensitivity in this model: $e^-p\to \tildee^-_{L,R}\chi^0_i+X, \tilde \nu_e\chi^-_1+X$, where $\chi^0_i(i=1,2)$ are thetwo lightest neutralinos and $\chi^-_1$ is the lightest chargino. We study theelastic and deep-inelastic contributions to the cross sections using theWeizs\"acker-Williams approximation. We find that the most promisingsupersymmetric production channel is right-handed selectron ($\tilde e_{R}$)plus first neutralino ($\chi^0_1$), with one hard electron and missing energysignature. The $\tilde\nu_e\chi^-_1$ channel leads to comparable rates but alsoallows jet final states. A right-handedly polarized electron beam at HERA wouldshut off the latter channel and allow preferentially the former one. With anintegrated luminosity of ${\cal L}=100\ipb$, HERA can extend the present LEPIlower bounds on $m_{\tilde e_R}, m_{\tilde\nu_e},m_{\chi^0_1}$ by$\approx25\GeV$, while ${\cal L}=1000\ipb$ will make HERA competitive withLEPII. We also show that the Leading Proton Spectrometer (LPS) at HERA is anexcellent supersymmetry detector which can provide indirect information aboutthe sparticle masses by measuring the leading proton longitudinal momentumdistribution.Comment: 11 pages, 8 figures (available upon request as uuencoded file or  separate ps files), tex (harvmac) CTP-TAMU-15/93, CERN/LAA/93-1

SUSY signals at DESY HERA in the no-scale flipped SU(5) supergravity model