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Protection & Prevention

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

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

A Brief Explanation of Thermal Runaway

In this article, Lectromec provides a basic summary of thermal runaway and the specific challenges it poses in aircraft, specifically regarding the shift toward more electric vehicles and the historically limited available space available for electronics on aircraft. Read more

Corrosion Prevention and AC 43-206 Part 3

In this article, we continue the discussion of AC 43-206 by addressing the equipment and tools utilized in corrosion prevention and maintenance as well as identifying potential hazards to personnel and equipment. Read more

Corrosion Prevention and AC 43-206 Part 2

In this article, we look at procedures identified in AC 43-206 for the cleaning of avionics equipment to remove and prevent corrosive deposits. After initial inspection and identification of corrosion in avionics systems, the next logical step is to perform cleaning procedures to reduce/eliminate the risks from corrosion. Inspection and cleaning procedures should be performed on a regularly scheduled basis, as well as immediately following any situation(s) in which the avionics components are exposed to probable sources of contamination (weather, salt spray, spilled fluid(s), cleaners used for nearby systems, and any remnants from repair). Read more

Corrosion Prevention and AC 43-206

This article will discuss inspection methods for evidence of corrosion on aircraft and aircraft systems; a future article will address some of the maintenance and cleaning guidance offered by AC 43-206. Read more

Skin Effect

An area of power transmission that we have not talked about in any Lectromec article thus far is the impact of skin effect. While this is an area that is well documented and understood for signal/data cables, the impacts in the area of power cables have been generally ignored. However, as power systems embrace new power technologies, skin effect starts to creep in to have a noticeable and measurable impact. In this article, we discuss what skin effect is and its impact.

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Partial Discharge at Altitude

PD is not a simple phenomenon to model as there are many environmental factors that have influence. Factors such as heat, humidity, pressure, are some that can change the voltages required to initiate and extinguish PD within a wire/cable’s insulation. This article specifically discusses the influence of altitude on partial discharge events. The consideration of the operational altitude effect on partial discharge is particularly necessary for aerospace applications as aircraft tend to spend a lot of operating time at high altitudes.

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Addressing the Big Questions of Partial Discharge

In this high-voltage present, wires and cables must address new challenges, perhaps the most notable is partial discharge (also referred to as corona). This article discusses the fundamentals of partial discharge, its impacts on wiring design, and test methods used to assess a component’s partial discharge performance. The PD may occur between (1) the conductor and insulation, (2) within void in the insulation, (3) between insulation layers, or (4) between the insulation surface and shield. Read more

Impact of Secondary Wire Harness Protection on Heating

If you are standing outside on a cold winter day, would you be warmer in a T-shirt or in a jacket? The answer is obvious, but somehow that ‘obvious answer’ is obscured when thinking of aircraft wire harness design. A common question of OEMs and aftermarket modifiers is: how much of an impact (if any) does secondary harness protection have on wire harness heating?

Lectromec took time this last week to put together a representative harness and run tests to generate data on the thermal impact of three secondary wire harness protection schemes. While this data is not representative of every wire harness configuration, it does provide a basis for determining if additional testing (or simulation) are needed for your application.

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