Human Factors

Developing EWIS Competencies in EASA Part 145 Organisations

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Close-up view of aircraft electrical wiring systems with colorful wires and terminal blocks, featuring Sofema Aviation Services logo and the title "Developing EWIS Competencies in EASA Part 145 Organisations

April 09, 2025

Steven Bentley

Sofema Aviation Services (SAS) considers key aspects related to the management of EWIS-related competencies within an EASA Part 145 Organisation. EASA expects organisations to manage and document the competencies of personnel involved in EWIS-related activities to maintain airworthiness effectively. Regulatory Foundation for Competency Requirements EASA regulations mandate clear competence requirements for Part 145 organisations concerning…

Development of EWIS Continuation Training

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Two individuals working on an electrical wiring test board with measuring instruments, representing practical EWIS training. Sofema Aviation Services logo and the text 'Development of EWIS Continuation Training' is displayed

April 03, 2025

Steven Bentley

Sofema Aviation Services (SAS) looks at the challenge of EWIS Continuation  Training While initial training introduces EWIS principles, continuation training reinforces, updates, and deepens that knowledge, addresses evolving risks, and helps mitigate human factors associated with long-term maintenance activities. Regulatory Basis for EWIS Continuation Training Under EASA AMC 20-22, organizations approved under Part-145 and other…

Part 21 Design Organisations Subpart J – EWIS Challenges & Mitigations

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"Electrical wiring and schematic diagram with orange fiber optic cables, overlaid with the Sofema Aviation Services logo and a title text about Part 21 Design Organisations Subpart J – EWIS Challenges & Mitigations."

April 02, 2025

Steven Bentley

Sofema Aviation Services (SAS) considers key elements of the EASA Part 21 EWIS design and best practice implementation. Introduction EASA Part 21 Design Organisations Subpart J face significant challenges in managing and maintaining Electrical Wiring Interconnect Systems (EWIS). Historical evidence, including major accidents has shown that improper EWIS design, maintenance, and oversight can lead to…

Key Responsibilities of EASA Part 21 Subpart J Design Organisations in Respect of EWIS Requirements

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EASA Part 21 Subpart J blog image

April 01, 2025

Steven Bentley

Sofema Aviation Services (SAS) Considers the EASA Part 21 Subpart J Design Organisation Key Responsibilities related to EWIS requirements Introduction Design Organisations under EASA Part 21 Subpart J hold a key responsibility in ensuring that EWIS is designed, installed, and maintained in a way that minimises the risk of fire, system failure, and safety hazards….

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