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Maintenance & Sustainment

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

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

Life-Limiting High Voltage Parts

Life-Limited EWIS parts can be useful where high voltage conditions make component degradation rates uncertain. Though accelerated aging can offer insight to the component’s condition, further observations of high-voltage systems will be needed for accurate degradation predictions. Read more

ICA Guidance for HIRF and Lightning Protection

The advisory circular 33.4-3, issued by the FAA offers guidance for developing adequate ICA for an aircraft’s HIRF and lighting protection functions. Read more

AS23053 Dimensional Life of Heat Shrink Tubing

We are told that low humidity and cool temperatures are the best way to extend component life, but even in such conditions not all components can sit on a warehouse shelf indefinitely awaiting the day of installation. One of the more susceptible EWIS components to aging on the warehouse shelf are heat shrink tubing. Here, we examine concept of dimensional life of heat shrink tubing.

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In Consideration of Backshells

The backshell of a connector is an item that perhaps does not get the attention that it should. Often the discussion of EWIS focuses on the wiring, the connectors, or managing the risk of EWIS failures, but the connector backshell is ignored. The simple connector backshell (that is anything but simple) is designed for support and protection of wires and cables physically and, in the case of signal cables, support and protect electrically too. The following is a brief introduction to backshells, their use, associated standards, and research that has been performed to determine what to look for when performing maintenance.

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Integrating EWIS into Fleet Sustainment and MECSIP

While the Electrical Wiring Interconnection System (EWIS) evaluations and sustainment requirements have been part of the Mechanical Equipment and Subsystems Integrity Program (MECSIP) since 2013, it is only just recently that EWIS elements are part of performance measurements. This webinar, presented by Lectromec, provides an excellent opportunity to improve your understanding of EWIS, EWIS requirements, and highlights a path for better and more cost-effective EWIS evaluation. Read more

EWIS and Aircraft Maintainability

The maintainability of the electrical wiring interconnection system (EWIS) is integral to the longevity of an aircraft. EWIS maintainability affects not only the EWIS itself, but any nearby system whose maintenance access is restricted by the location or function of the EWIS. Thus, high maintainability of the EWIS allows for faster, more efficient, and more precise maintenance of surrounding equipment and systems.

Original aircraft design must comply with EWIS regulations in the development stage to ensure long-term maintainability. It is important to know which regulations apply and which standards to follow when designing an aircraft to determine the appropriate maintenance requirements.

Here we will explore the requirements of some of the more common standards for EWIS maintainability in aircraft design.

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