In this study, we propose a revised detailed kinetic model for ammonium perchlorate (AP) combustion, leveraging recent advances in the modelling of ammonia chemistry. The gas-phase mechanism is validated against data on species sampling in jet-stirred reactors, laminar flame speed measurements, and ignition delay time. A new model of AP decomposition in the condensed phase is proposed to be used with the gasphase mechanism. The AP laminar flame is then simulated in the 1D coupled approach. These calculations provide results on the regression rate, surface temperature, temperature sensitivity and species profiles for a prescribed initial temperature of AP and ambient pressure. Stability analysis of the coupled model is carried out employing the Zel'dovich-Novozhilov method.