Maximum Harness Ampacity
The fundamental concept here is harness ampacity: the maximum amount of current transferred down a wire harness without exceeding the temperature rating for any component. Read more
Blog
FAQs of EWIS Service Life Extension Programs
Lectromec has accumulated a set of frequently asked questions related to wire system sustainment. Here, we cover several high level questions about the assessment and its value and the subsequent article we will delve into some of the more technical details. Read more
Aging Aircraft Wire
Aging aircraft wiring is a problem affecting the entire aviation industry. Lectromec’s evaluation of the 2016 service difficulty reports found that aircraft over 25 years old were more than two times likely to suffer problems with their wiring system. There are tools and analyses to get ahead of these issues. Read more
Insulation Resistance: Measuring Leaky Wires
Wire insulation integrity is a fundamental part of wire performance. Without it, the safety and reliability of a wire is significantly reduced. Over the years, the industry has developed dozens of insulation integrity assessment methods. Among the range of tests that exist in the world of wiring, one of the tests that is often misunderstood […] Read more
Getting the Right Data
How important is it to have the right data on your wire and cable products? For those seeking qualification to a product standard, having test data that matches the requirements is important. Without this data, qualification cannot happen. But what about the products that fall outside of industry standards? How many tests are necessary to […] Read more
Latest Developments in Wire and Cable – SAE 8A 8D Spring 2018
It is not often that you find more than two people in a room with a passion for aerospace wiring systems. One of the exceptions is the bi-yearly gathering of wiring system component and EWIS experts for the SAE 8A/8D committee. Last week, Chicago, Illinois was the host for this event that covered a wide […] Read more
When to Pull the Component – End of EWIS Component Service Life
What is the end of life for a wire, cable, connector, or any Electrical Wiring Interconnect System (EWIS) component? This is a straightforward question that should have a straightforward answer, but often, this is an unanswered question. Regulatory guidance such as Fuel Tank Ignition Source Prevention Guidelines from the FAA think of wiring as something […] Read more
Shield Grounding and EMI Protection – Part 2
EMI, the concept of electromagnetic interference, is a relatively simple one to convey: radiated energy from other sources induces a voltage in another circuit. But like many things, the simplicity of its description belies the true complexity of mitigating it. Shielding of signal wires, wire harness shielding, shielding of power wires, induced noise studies are […] Read more
Shield Grounding and EMI Protection
The push for more electric aircraft is driven by weight savings and the availability of reliable electrical components. This is made possible with greater power generating capacity, however, this comes with an increased challenge of ensuring reliable data transmission. More power flowing through the aircraft means higher levels of electromagnetic interference (EMI). Aerospace environmental test […] Read more
Correcting Bad Wire System Guidance
Consider a common aircraft wire: how many requirements and standards must be considered during its design and fabrication? A simple back-of-the-envelope calculation suggests at least 30 various requirements and standards. For an aircraft wire harness, that number can easily jump to 50. Without a doubt, between each of these standards and requirements, there can be […] Read more