Engineering safety. By design.

PHASR Systems covers the complete development and safety analysis cycle through two workbenches. The Development Workbench includes the Function Tree, Architecture and Requirements workspaces. The Safety Workbench includes the FHA Workspace (covering aircraft-level and system-level functional hazard assessment), the Safety Assessment Workspace (PASA, PSSA, FTA, FMEA, SSA and ASA), and the Common Cause Workspace (ZSA, PRA and CMA). The platform is designed to align seamlessly with industry-standard aviation development and safety processes.

Yes — seamless integration across levels is a core design principle. The FHA Workspace covers both the Aircraft FHA (AFHA) and System FHA (SFHA) in one environment. The Safety Assessment Workspace runs from PASA at aircraft level through PSSA, FMEA, FTA, SSA and ASA. Design organisations working on full aircraft programmes and those focused on a single system can both use the platform effectively.

The FTA engine inside the Safety Assessment Workspace is a dedicated, professional-grade tool. It supports quantitative probability calculations, minimal cut set analysis, and importance measures (Fussell-Vesely, Birnbaum and others). Fault trees are linked directly to your PSSA reliability allocations so results feed automatically into your compliance matrix. Export to PDF or DOCX with your report template is included in the Pro tier.

The Common Cause Workspace covers three methods. Zonal Safety Analysis (ZSA) examines each physical zone of the aircraft for installation errors, maintenance errors and interference between systems. Particular Risk Analysis (PRA) assesses external threats such as fire, lightning, bird strike, hydraulic fluid leaks and high-intensity radiated fields. Common Mode Analysis (CMA) identifies shared failure sources — common hardware, software, processes or environments — that could invalidate independence assumptions in your fault trees.

The Free tier gives you full access to the Function Tree Workspace — build complete functional decompositions, number and describe your functions, and establish the traceability baseline for your project. The Pro tier unlocks both workbenches in full: all safety workspaces (FHA, Safety Assessment with FTA, Common Cause), all development workspaces (Architecture with block diagrams and ICD, Requirements with traceability matrix), and templated PDF/DOCX export across all workspaces.

Enterprise adds extended functionality within the Architecture, Requirements and Common Cause workspaces — advanced interface management, extended block diagram capabilities, and deeper common cause analysis tools. It also adds team collaboration with role-based access and review workflows, making it the right tier for full design organisations rather than individual engineers.

The Requirements Workspace runs as a persistent backbone across all other workspaces. Safety objectives derived from the FHA become traceable requirements. Reliability allocations from PSSA are linked to architectural items. Every requirement tracks from its origin through to verification evidence in the SSA or ASA. When an authority asks 'show me how this safety objective is met', you can trace it end to end in seconds.

Your project data is stored securely using Supabase, hosted on AWS infrastructure in the EU. Row-level security ensures that only you — and team members you explicitly grant access to — can view your projects. All data is encrypted at rest and in transit. We do not share or use your project content for any purpose other than providing the PHASR Systems service.