Fault Tree Analysis (FTA)

EASA Cyber Security – Guidance on Performing a Product and Part Security Risk Assessment (PISRA)

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A close-up of a hand interacting with a digital interface displaying "RISK MANAGEMENT" and various security-related icons. The image includes the Sofema Aviation Services (SAS) logo and a blog series banner on cyber security, with the title "EASA Cyber Security Guidance on Performing a Product and Part Security Risk Assessment (PISRA).

March 12, 2025

Steven Bentley

Sofema Aviation Services (SAS) considers key aspects in relation to the process for the Security Risk Assessment identified in ED-202A Section 2.1.1 (PISRA). ED-202A Section 2.1.1 is an acceptable means of compliance for performing the PISRA for products and parts under Annex I (Part 21) to Regulation (EU) No 748/2012. Additional guidance material for the…

Techniques for Identifying Underlying Causes in Safety Incidents & Use of Practical Tools and Methods

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Safety Incidents blog image

November 25, 2024

Steven Bentley

Sofema Aviation Services (SAS) www.sassofia.com considers a number of techniques suitable for identifying underlying causes in safety incidents, focusing on practical tools and methods relevant to design organizations Introduction For identifying the underlying causes of safety incidents, we should focus on techniques that effectively uncover root causes and inform risk control and mitigation strategies. Consider the…

Considerations Related to the Application of Aerospace Recommended Practice – ARP 4761 and ARP 4754A

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SAS considers the role and purpose of Society of Automotive Engineers (SAE) Aerospace Recommended Practice - ARP 4761 and ARP 4754A

January 05, 2024

Steven Bentley

Sofema Aviation Services (SAS) www.sassofia.com considers the role and purpose of Society of Automotive Engineers (SAE) Aerospace Recommended Practice – ARP 4761 and ARP 4754A Introduction Aerospace Recommended Practices ARP 4761 and ARP 4754A are two crucial guidelines in the aviation industry, issued by the Society of Automotive Engineers (SAE). ARP 4754A and ARP 4761 emerged…

General Introduction to Probability Determination Methods

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Probability-Determination-Methods

September 28, 2023

Steven Bentley

Sofema Aviation Services (SAS) www.sassofia.com considers the Probability Determination Methods – primary techniques to analyse the potential risk of a system, product or process. Introduction Determining safety during certifications often involves assessing the potential risks associated with the use or operation of a particular system, product, or process. A number of Probability Determination Methods are available…

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