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By: Laura Wishart

A Guide to Aircraft Lightning Standards

Laura Wishart
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

A Brief Explanation of Thermal Runaway

Laura Wishart
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

CFR 25.1717 – Circuit Protection and EWIS

Laura Wishart

Circuit protective devices are circuit components whose purpose is to disconnect power to the circuit in the event of a fault condition. The fault conditions vary based on the circuit type, attached equipment, and power capacity of the attached circuit. Some common fault conditions include overheating, overcurrent, and electrical arcing.

To meet the diverse needs of varying circuit designs and functions across electrical systems, several types of circuit protection are available. Each type has benefits and drawbacks, and it is important to evaluate each to determine the best option for a given electrical system. Read more

Corrosion Prevention and AC 43-206 Part 3

Laura Wishart
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

Laura Wishart
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

Laura Wishart
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

IEC 60851-5 Winding Wires – Electrical Property Test Methods

Laura Wishart
Winding wires, or magnet wires, are the wires used to construct coils in electronic components (transformers, relays, etc.) that generate the component’s magnetic field. These wires are primarily composed of a copper or aluminum conductor with a very thin layer of insulation. The insulation layer is as thin as possible to keep the wire cross-section small making it possible to squeeze the highest number of windings in the motor. Whereas most electrical wires are cylindrical, winding wires often have a rectangular cross-section profile; this allows for maximum cross-section during winding, thus reducing potential losses. Read more

Heat Shrink Tubing Tests

Laura Wishart
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

Laura Wishart
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

AIR7502 and Future Implications for Aviation

Laura Wishart
The AIR7502 defines voltage levels for HV aircraft and components. The extent to which AIR7502 is incorporated into the aerospace industry remains unsure, but the implications of the document are worth considering even before the document’s use is determined. Read more