Welcome to our website. Parnassus is an aerospace system safety and reliability engineering provider which began in 1979 as a systems engineering and program management consultancy located in southern California. We apply the technical expertise required to perform the analytic tasks set forth in SAE ARP4754A, ARP4761 and MIL-STD-882 including program planning, functional / physical hazard analysis, evaluation and development of mitigation strategies, PSSA and SSA, as well as military style SSHA and SAR data item preparation.