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By: Michael Traskos

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

What is an EWIS Qualified Wire?

This is a question that Lectromec regularly receives. The reason for this question is that a parts-supplier or system-integrator is looking to find wires in compliance with EWIS requirements. Since there are so many ways to evaluate any component, the important question to consider is if a defined requirements list for aerospace wire exists? Here, […] Read more

Connector Failure Rates – Part #2

In Lectromec’s previous article, we introduced a basis for estimating connector failure rates. The framework utilized the failure information available from military handbook MIL-HDBK-217. In this article, we continue to review the parameters of the failure rate function and implications on how slight changes in the environment can have a dramatic impact on a connectors […] Read more

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

What Are You Missing from Your Risk Assessment?

Creating maintenance action plans for vehicle sustainment is a heavily detailed process involving the collaboration between multiple groups. If any group has a less detailed (or flawed) analysis, the potential impact could be felt for years/decades to come. A structured process for assessment is outlined in the mechanical subsystems integrity program (MECSIP) outlined in military […] Read more

Frequency of Wire System Incidents

In July 2017, Lectromec published a white paper on electrical wiring system failures on commercial aircraft. This is a brief video of the finding and what can be done to improve EWIS reliability in commercial aircraft. Read more

Getting the Most Value from Wire System Degradation Assessments

Task four of military handbook MIL-HDBK-525 (also incorporated into the mechanical subsystems integrity program standard MIL-STD-1798) outlines a set of considerations and procedures for the assessment of an aircraft electrical system specifically for the service life extension program (SLEP). The important factor is to ensure that resources are not wasted on this effort and that […] Read more