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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

Physical Impact on Coax Cable Performance – Holiday Season 2023

Every year, Lectromec creates a video to celebrate the holiday season. This year, we decided to piggyback on an article from last month and continue testing coax cable. This year’s holiday video title, “Think ‘Drummer Boy’, but instead of a drum, the boy is striking a coax cable” examines the impact different severities of physical impact have on coax cable performance. Read more

Superconductors and Wire Qualification

Discovery of a room temperature superconductor would have a tremendous impact on the aerospace industry and could result in lighter aircraft. In this article, we consider this impact and discuss steps that would need to be taken by the industry before a superconductor could be practically incorporated into aerospace applications. Read more

Minimum Coaxial Cable Bend Radius

The impact of a coaxial cable’s bend radius is not well defined from an initial evaluation standpoint. Standard restriction on the minimum bend radius for coaxial cables has remained unchanged for over 40 years whereas materials and construction methods have seen great improvement. In this article, Lectromec measures the attenuation of a modern coaxial cable at different bend radii to identify the severity of the impact a tighter bend radius has on the performance of the cable. Read more

A Guide to Aircraft Lightning Standards

Lightning protection requirements are not as straightforward as looking up a numerical value for insulation resistance or verifying the interchangeability of connector pins, and it is not exclusively an EWIS issue. Adequate consideration involves high level evaluation of the aircraft as a whole. In this article we identify several standards and documents that offer guidance in aircraft lightning protection. Read more

Creepage and Clearance

High voltage systems on aircraft will be more commonplace as the eVTOL market “takes-off.” One safety aspect that often comes up is the separation of the high voltage; often, this comes down to creepage and clearance distance of these systems. Read more

Heat Shrink Volume Resistivity

Heat shrink tubing is used throughout an aircraft’s Electrical Wiring Interconnection System (EWIS) and must withstand the stresses set upon it in the standard testing. Volume resistivity is just one of many properties that are evaluated while qualifying heat shrink tubing. Read more