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By: Michael Traskos

Inspectability of EWIS

Though EWIS should be protected from hazards such as tampering, FOD, and fluid exposure, the system does need to be periodically inspected and maintained throughout its service life. In this article, we discuss some of the industry guidance, regulations, and methods commonly used to ensure accessibility of the EWIS for the appropriate personnel. Read more

Insertion Loss and Attenuation

Insertion loss and attenuation are similar concepts, but one is assigned to a single component (insertion loss) whereas the other is assigned to generalized performance (attenuation). In this article, we will discuss the similarities and differences of these concepts and how proper testing of each can ensure reliability in signal transmission. Read more

The Use of Splices

Though useful in repairs and modification, overuse of splices can lead to serious electrical and mechanical problems in an electrical system. This article discusses the applications and restrictions of electrical splices on aircraft. Read more

Protected Harness Design

Wiring harness protection materials address needs such as fire protection, physical damage protection, chemical protection, and wire management but may also present challenges such as overheating or difficulty of access for maintenance activities. In this article, we elaborate on some of the common uses of added harness protection and address many of the benefits and drawbacks of open vs protected harnesses. Read more

Forced Hydrolysis

The goal of forced hydrolysis testing is to represent decades of wet/humid environmental exposure on polyamide-insulated aircraft wiring. This article discusses forced hydrolysis testing in detail, including history, applicability, and performance of the test. Read more

Voltage, Current, and Thermally Rating Connectors

While electrical component qualification is nothing new to the aerospace industry, the emerging trend toward full aircraft electrification requires every component to be electrically connected; for most equipment, this means incorporation of electrical connectors. Weight, cost, reliability, and performance are the four most common elements initially considered in connector selection, but the finer details of electrical connectors use must also be considered. Here, we discuss how one might go about qualifying an electrical connector, specifically, to address its voltage, current, and thermal limitations. Read more

Copper Hookup Wire

Aerospace standards like the ASTM B470 or the ASTM B355 provide specific performance characteristics of electrical wire conductors. This article discusses some of the test methods covered in these standards and how their implementation ensures acceptable quality in the development of aerospace wire. Read more

Are New EWIS Regulations Needed for High Voltage EWIS?

High voltage power has been a hot topic in the aerospace industry for several years now. As programs have been getting closer to a marketable product, regulators are seeking to determine the regulatory basis for these new platforms. One question that has been raised in several committee and industry meetings, “Are New EWIS regulations needed for High Voltage Wiring Systems?” Read more

HV Connector Failures and Part Selection

With the current shift toward hybrid and electric aircraft, deeper understanding of high voltage connectors and their potential failure modes is required. In this article, we discuss failure modes and selection criteria for high voltage connectors on aircraft. Read more

S&T 2022 Meeting Report

As in any scientific industry, aerospace across the globe benefits from the sharing of information and research. The annual S&T Electrical Systems and Wiring Inter-Agency Meeting is held each December with exactly this goal. The following are some highlights from the presentations and discussions from the 2022 meeting. Read more