Sofema Aviation Services (SAS) considers key aspects related to EWIS Design Considerations Electrical Wiring Interconnection Systems (EWIS) are a critical safety component of modern aircraft. Historically overlooked or treated as secondary to other systems, poor EWIS design has contributed to multiple catastrophic failures (TWA 800 – Swissair 111 –United Airlines (UAL) Flight 811 usually with…

Sofema Aviation Services (SAS) considers the specific requirements of Part 91 Subpart L Introduction Subpart L of 14 CFR Part 91 focuses on maintaining the airworthiness and structural integrity of ageing aircraft. Below is a breakdown of the specific requirements: 91.1505 – Repairs Assessment for Pressurised Fuselages This regulation mandates repair assessments for specific pressurised…

Sofema Aviation Services (SAS) takes a view on the key aspects that drove the regulatory requirement for EWIS Training FAA & EASA Electrical Wiring Interconnection Systems (EWIS) training requirements reflect lessons learned from accidents, research findings, regulatory studies, and industry experience. The overarching rationale is to ensure the continued airworthiness and operational safety of commercial…

Sofema Aviation Services (SAS) considers key aspects related to EWIS Design Considerations Introduction As aircraft systems continue to evolve, the complexity and safety-critical nature of Electrical Wiring Interconnection Systems (EWIS) demand a robust and harmonised regulatory approach. Recognising this, both the Federal Aviation Administration (FAA) and the European Union Aviation Safety Agency (EASA) have issued…