民用航空系统与设备安全性评估实施准则与分析方法 (ARP4761 / ARP4761A)

ARP4761 Safety Assessment Workflow Architecture

FHA, Fault Tree Analysis (FTA), FMEA, and Common Cause Analysis (CCA)

Central System: Probabilistic Safety Assessment Core - Minimal Cut Set & Reliability Engine

Aviation Architecture Nodes

• Functional Hazard Assessment (FHA)
• Quantitative Fault Tree Solver (FTA)
• Failure Modes & Effects Summary (FMEA)
• Zonal Safety Analysis Inspector (ZSA)
• Particular Risk Analysis Engine (PRA)

Architectural Layers & Protocol Stacks

• Functional Hazard Classification (FHA) (Qualitative Severity Matrix / Aircraft Flight Phase Mapping): Qualitative assessment establishing top-level safety objectives for loss or malfunction of aircraft functions.
• Quantitative Fault Tree Analysis (FTA) (Minimal Cut Set Algorithm / Boolean Reduction / Mocus Solver): Boolean logic modeling of system failures combining basic events via AND/OR gates to prove top events satisfy < 10^-9 probability bounds.
• Failure Modes and Effects Analysis (FMEA) (Component Failure Rate Databases (NPRD/EPRD) / FMECA / Mil-Hdbk-217FN2): Bottom-up analysis evaluating component failure modes, propagation paths, local effects, and final aircraft-level safety impacts.
• Common Cause Analysis Suite (CCA) (ZSA 3D Spatial CAD Clearance / CMA Hardware/Software Segregation / PRA Debris Trajectories): Encompassing Zonal Safety Analysis (ZSA), Particular Risk Analysis (PRA - bird strikes, uncontained rotor bursts), and Common Mode Analysis (CMA).

Flight Telemetry Metrics: < 10^-9 (Catastrophic Top Event Probability) | Zero (Single Point of Failure Allowance) | 3 Techniques (Common Cause Analysis (ZSA, PRA, CMA)) | 100% (Minimal Cut Set Verification Coverage)