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Certification

Connector Failure Rates – Part #1

Coming up with failure rates of electrical components is always a difficult task. Historically, when failure modes and effects analyses were created for aircraft systems, the level of detail of EWIS component failures were severely lacking. Some organizations would create a single failure number for an entire circuit, regardless of the wires or connections made […] Read more

Designing for Relays

Power transfer through aircraft or any electrical system requires components that have the capability to turn on and off. These switches, contactors, transistors, and electrical relays that route power through the aircraft are life limited parts. Whether from a design or sustainment view, understanding how these components degrade over time and what to look for […] Read more

Selecting the Right Wires and Cables

In reviewing Lectromec’s articles, one can find over 250 articles covering different segments of aerospace wiring systems and lifecycle. For some, this may be an overload of information. But, if these articles were consolidated to their fundamentals, one can conclude that by selecting the right parts, installing them the right way, and doing the right […] Read more

Does a Connector’s Plating Type Impact Performance?

Design and installation of an aircraft’s electrical system has been made significantly easier with the adoption of modular harness design. This design pattern allows for discrete wiring sections to be designed and fabricated; this is only possible with the reliable performance of connectors. The connector-ization of harnesses has led some OEMs to build platforms where […] Read more

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