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Testing & Assessment

Heat Shrink Tubing Tests

Heat shrink tubing is a very commonly used component in Electrical Wiring Integration Systems (EWIS). Just as with any other component of an aircraft wiring system, heat shrink tubing must withstand extensive severe testing before being approved for use. This article reviews select standards and methods for heat shrink tubing testing. Read more

Heat Shrink Tubing Flammability Tests

As is the case with many components in electrical wiring, one of the most important properties of heat shrink tubing is its resistance to fire. Take a look at several methods used to determine and categorize the flame-resistant properties of heat shrink insulation tubing. Read more

Which Red Plague Testing is Right for My Application?

In short, red plague is corrosive galvanic corrosion that occurs between the silver plating and copper core of silver-plated copper wire. This has been a known issue since at least the 1950s and has popped up dozens of times since then with issues identified during initial product inspection. This article dives into the practical applications of red plague testing and how to identify and potentially mitigate the risks thereof. Read more

High Voltage Arc Tracking Requirements (Part 2)

In part 2 of this article series, we continue to discuss how arc track resistance testing as we know it must be re-evaluated as more HV systems with unique testing requirements lead the aviation industry moving forward. Read more

High Voltage Arc Tracking Requirements (Part 1)

Arc track resistance testing has been a staple of the aerospace industry for nearly 40 years. This originated from the issues raised in the 1980s with polyimide insulated wire. Since that time, test methods have evolved to assess and quantify the susceptibility of wires to carbon arc tracking and the ability to withstand electrical arcing events. Read more

The Longevity of High Voltage Components

What does a wire need to do in the high voltage system, and how does it need to perform? This article reviews some of the fundamental concepts involved and what needs to be done to show a wire is compliant with the vehicle’s requirements. Read more

Low Temperature Bend Testing for Lunar Applications

NASA sought to evaluate wire and cable flexibility for lunar applications; specifically looking to evaluate the ease of reeling/unreeling wire and cable in lunar environments. Bend testing was performed on 35 different insulated wire and cable constructions at liquid nitrogen temperature to evaluate flexibility in extreme cold conditions. It was the intent of this effort that, “testing at the extreme cold temperature of liquid nitrogen will begin to build a database of what off-the-shelf types of wires and eventually cabling may be applicable to the lunar environment.” Read more

Pull Through Testing- An Addition to NEMA 27500

An area that has been poorly defined until recently has been the potential damage to wire/cable insulation due to wiring installation on aircraft. The latest revision of NEMA 27500 has looked to address this gap in cable assessments. In this article, we review the test requirement, expected performance, and what the results may mean to designers and installers.

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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

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