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Visual Inspection

11 improvements to MIL-HDBK-522 for aircraft wire systems

One of the best handbooks on EWIS routine inspection for aircraft wire systems is the military handbook MIL-HDBK-522, Guidelines for Inspection of Aircraft Electrical Wiring Interconnect Systems. The first version of the handbook was released in 2010 and provided a good starting point for EWIS inspection guidance. This guidance has been updated with the release […] Read more

EWIS system design: Aircraft wire maintainability

The SAE Wire Installation Guidance document, AS50881, provides guidance on considerations for designing an aircraft wiring system. In this article, we examine sections of the AS50881 and discuss how each of these sections should be addressed and what factors should be considered when designing an aircraft’s Electrical Wire Interconnection System (EWIS). For this area, there […] Read more

The benefits of aircraft electrical system analyzers with Chris Teal

Welcome to the Lectromec podcast with John Gilroy. The podcast that helps you improve your understanding of aircraft electrical systems. Every month we interview experts in the public and private sector to help you increase your knowledge of the design and maintenance of aerospace wire systems. Today’s guest is Chris Teal, the Marketing Director from […] Read more

How to identify an aircraft wire or cable

If you are trying to identify an aircraft wire or cable, you may want to take advantage of the lessons Lectromec has learned in the past three decades. Because we are in the business of evaluating electrical systems, we frequently open up boxes where we must determine origin and manufacturer of wire and cable. This […] Read more

Completed aircraft wire harness testing

When it comes to examining aircraft wire systems, a lot of time is spent examining the performance of individual components like wires, cables, connectors, and pins. However, when we install complete aircraft wire harnesses, they must work in the fully assembled aircraft. They must endure the harsh conditions, various environments, and regular maintenance. To ensure […] Read more

Taking a look at aircraft wire testing and evaluation

For the past thirty years, Lectromec has been a leader in the area of aerospace wire testing and evaluation. In order to provide aerospace professionals with information to increase their knowledge of this complex topic, we began creating educational materials. Accordingly, Lectromec has published almost two-hundred articles, distributes a monthly newsletter, has a podcast, and […] Read more

What do the results of arc track resistance testing mean?

Wire manufacturers must ensure that their products can withstand a wide variety of tests. One important test for aerospace professionals is called the “arc track resistance”test. This test is significant because an unconstrained electrical arc can impact the safety and reliability of the Electrical Wiring Interconnection System (EWIS). In this article we will define the […] Read more

Aircraft wire inspection? Time tested guidelines

Performing routine aircraft wire systems visual inspections is a critical aspect of maintaining aircraft airworthiness and extending the component lifecycle. A visual inspection is the first step in assessing the condition of a component or determining what future steps need to be taken. This article discusses recommended techniques based on MIL-HDBK-522, which provides EWIS inspection […] Read more

Commercial airliner EWIS life extension

This article is the first in a series aimed to inform how to safely extend the life of commercial aircraft from the electrical wire interconnection system (EWIS) perspective, or what some would call EWIS Life Extension. The article gives an overview of the 2008 Federal Aviation Administration’s guidelines for EWIS. Read more

Lessons learned from NASA: Wire identification, harness clamping, and more

Learning from the mistakes of the past is critical for ensuring reliability of systems created today. These lessons may be contained in industry standards documents with little or no explanation as to why the requirements were created (such as AS50881). This lack of historical knowledge and the loss of the answer to ‘why’ can leave […] Read more