How do you plan and execute flight test validation of avionics systems?

Flight test validates avionics system performance and certification compliance. Planning: Test objectives derived from certification requirements and design specifications, Test matrix covering flight envelope (altitude, speed, configuration), Build-up from ground test through envelope expansion, and Risk assessment with mitigation measures. Execution: Instrumentation for data recording (flight test equipment), Real-time telemetry for safety-critical tests, Specific test conditions (GPS degraded, sensor failures), and Qualified test pilots with defined procedures. Key areas: Navigation accuracy versus references (DGPS truth), Sensor performance in flight environment, System behavior under induced failures, Human factors evaluation by operational pilots, and EMI/EMC in actual flight environment. Data analysis: Comparison to requirements, Statistical analysis for performance margins, and Identification of anomalies. Documentation: Test reports supporting certification, showing compliance with applicable standards. Flight test insights often drive design refinement.