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Certification

Maximizing Electrical Component Performance

Most components for electrical systems will have an accompanying product specification or product information sheet. These information sheets contain a lot of information that include mechanical, thermal, and electrical performance and this information is regularly used by engineers to make technical decisions. This performance information is necessary to reduce engineering time and avoid the need […] Read more

Can the EWIS be Safe After a Modification?

The days of ‘fit and forget’ EWIS are at least a decade behind, the aircraft industry’s understanding of the implications of wiring as a system continues to evolve. New aircraft have gone through EWIS evaluations to ensure that the EWIS complies to regulations – not an easy task. Obviously, as the OEM design choices remain […] Read more

Space Certified Wires and Cables

In the last three months, Lectromec has been asked numerous times about “Space Certified Wires” (SCW). The basic premise of these questions has been whether there is a defined set of criteria that would show a wire or cable is suitable for space applications. The primary concern raised is can there be a single set […] Read more

EWIS Considerations for UAVs

Many of the Unmanned Aerial Vehicles (UAVs) built have been for military applications. As this technology has matured so has the reliability. The improvements in reliability have made it a viable consideration to support civilian applications. Right now, the FAA has not certified a UAV, but undoubtedly this will occur. This video provides a cursory […] Read more

European Arc Track Resistance Testing

The arc track resistance test is a basic performance test for most aircraft power carrying wires. As with any component assessment tests, there are many ways to evaluate a wire insulation’s propensity for arc tracking. The European wet short circuit test standard, EN3475 Method 605, is one means to determine the arc track resistance performance […] Read more

Avoiding Fuel Tank Ignition

The number of aircraft accidents involving fuel tank ignition has thankfully been very low. However, the growing use of electrical power in aircraft has increased the number of wires and the likelihood of being routed near fuel system components. The increased electrical component density comes with a higher probability of a failure event occurring. In […] Read more

EWIS Design Changes – How to Achieve a Safe Separation Distance

Those familiar with aircraft wire system design know the limited available space in which wiring is usually routed. Often in tight quarters with other wire harnesses, redundant systems, and hydraulic lines, it can be very difficult and intimidating to identify safe separation distances in design and for retrofits. Adding to the complexity, a wire harness […] Read more

Meeting Requirements for EWIS Certification

There are more than 17 parts to the FAA’s Electrical Wiring Interconnection System (EWIS) regulations enumerated in the 25.1700 series. To show compliance with each of these regulations require a thorough subject area understanding. More so, as the EWIS evolves in design, it becomes clear that achieving EWIS certification requires a lot of data. If […] Read more

Electrical Fault and Fire Prevention and Protection

The prevention of electrical fires is a common goal for most aircraft systems. Advisory Circular (AC) 25-16, “Electrical fault and Fire Prevention and Protection”, released in 1991, can be considered one of the precursors to the Electrical Wiring Interconnection System (EWIS) regulations. Although the document is now 25 years old as of last month, AC 25-16 provides a wide variety of recommended practices that are commonplace in the EWIS design and installation. Here we review some of the key points addressed in AC 25-16 and considerations with modern EWIS design with respect to electrical fault and fire prevention and protection. Read more

High-speed footage of wire failure near fuel line

Introduction As with most fields, the more we learn about a particular topic, the better our understanding of its complexity and the finer details involved. One area Lectromec has done extensive research in is the potential impact of wire failure and electrical arcing (you can find several blog posts and white papers here). In this […] Read more