ED-135

ED-135 | Guidelines for Conducting the Safety Assessment Process on Civil Airborne Systems and Equipment

WG-63
System Engineering
December 2023

This document presents guidelines for conducting an industry accepted safety assessment process consisting of the Aircraft Functional Hazard Assessment (AFHA), Preliminary Aircraft Safety Assessment (PASA), System Functional Hazard Assessment (SFHA), Preliminary System Safety Assessment (PSSA), System Safety Assessment (SSA), and Aircraft Safety Assessment (ASA) processes.

This document also presents information on the safety analysis methods that may be used to conduct the safety assessment process. These methods include Fault Tree Analysis (FTA), Dependence Diagram (DD), Markov Analysis (MA), Model-Based Safety Analysis (MBSA), Failure Modes and Effects Analysis/Summary (FMEA/FMES), Cascading Effects Analysis (CEA), Zonal Safety Analysis (ZSA), Particular Risk Analysis (PRA), and Common Mode Analysis (CMA).

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