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EN2235 Review and Comparison to NEMA 27500

Cables are complicated engineered products. They range from the simple twisted pair (simple but requiring precise twists per foot) to the complicated signal and data cables used in many applications. Just as the NEMA 27500 cable standard is the go-to cable for many aerospace applications in the US, the EN2235 shares the same status in the EU. The requirements for these cables are outlined in this article. Further, we examine the differences between the EN2235 cables and the NEMA 27500 cables. Read more

EWIS and Aircraft Maintainability

The maintainability of the electrical wiring interconnection system (EWIS) is integral to the longevity of an aircraft. EWIS maintainability affects not only the EWIS itself, but any nearby system whose maintenance access is restricted by the location or function of the EWIS. Thus, high maintainability of the EWIS allows for faster, more efficient, and more precise maintenance of surrounding equipment and systems.

Original aircraft design must comply with EWIS regulations in the development stage to ensure long-term maintainability. It is important to know which regulations apply and which standards to follow when designing an aircraft to determine the appropriate maintenance requirements.

Here we will explore the requirements of some of the more common standards for EWIS maintainability in aircraft design.

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Top 5 Articles from 2020

In 2020, Lectromec’s website repository of articles on EWIS and EWIS related topics exceeded 300. The best part is that there is so much more to cover, and we will continue to do so in 2021.

But before we get ahead of ourselves, it is time for the yearly gathering of the most popular articles of the last 366 days. While we published fewer articles in 2020, the quality did not diminish. Here are the top 5 of 2020.

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EWIS Yule Log

With 2020 drawing to a close, we wanted to finish our busiest year in our lab with one more experiment. We hope that you all enjoy Lectromec’s version of the traditional yule log. Read more

Impacts of Sanitizing Fluids on Wiring

Key Takeaways COVID-19 has resulted in a higher concentration of sanitizing products being used on aircraft. The FAA has released special airworthiness information bulletins highlighting the concerns with the application of sanitizers on aircraft. An internal Lectromec study was performed to determine effects of sanitizing fluids on wires. Wire and cable are exposed to a […] Read more

New Means to Assess Corrosion Susceptibility

Low outgassing materials are critical for space applications. As one might imagine, a small, enclosed space with outgassing materials is not an ideal environment. To that end, space system developers have always sought insulation constructions with low outgassing properties. In past articles, Lectromec has covered the developments of the methods and materials used to reduce outgassing. Here, we examine the latest testing techniques for these materials. Read more

WPAFB Wire Study

Key Takeaways Publicly available recorded data compares many of the commonly used aerospace wire types. Corona extinction and inception voltages of cables decrease drastically with an increase of elevation. Many insulation types display a significant decrease in mechanical durability at increased temperatures. Modern wires of the AS22759 family are incapable of stopping 270 voltage DC […] Read more

IEEE 1584-Arc Standard

Key Takeaways IEEE 1584 provides a basis and a model for arc flash protection and necessary safe separation distance. The standard targeted the necessary calculations for power distribution. While there is some overlap with the aerospace industry wiring system requirements, the model’s range inhibits its use for aircraft. Research down an unfamiliar path often includes […] Read more

Conductor Resistance ASTM B193

The measurement of resistance seems to be a trivial task. Hook up a standard handheld multimeter with two probes and attach the probes to either side of the device or component that you want to measure. For the most part, this process works well. More correctly, for devices with resistances between 2 Ohms and 1M Ohm, this is a good technique, however, once the resistance values get really high or really low, the process becomes a little more complicated. While the basic physics remains the same (Voltage = Current * Resistance), getting the setup to correctly measure the component requires attention to detail. Read more

AS4372 – Building a Wire/Cable Specification

While it is possible to start from scratch and develop an independent set of tests and performance requirements, there are existing standards that can be used to expedite the process. Read more