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Maintenance

Have we Reached the End of Aging Aircraft Wiring Systems? – Part II

At the start of the last article, the question was posed, “Is it possible that aircraft wiring reached a point where aging/degradation is a thing of the past?” In that article, four elements were identified that must be satisfied for wires/cables to be considered as age-free. The insulation and conductor aging factors were examined in the last article, and here we consider the remaining two: Design limits and random shocks. Read more

Aging Aircraft Wire

Aging aircraft wiring is a problem affecting the entire aviation industry. Lectromec’s evaluation of the 2016 service difficulty reports found that aircraft over 25 years old were more than two times likely to suffer problems with their wiring system. There are tools and analyses to get ahead of these issues. Read more

When to Pull the Component – End of EWIS Component Service Life

What is the end of life for a wire, cable, connector, or any Electrical Wiring Interconnect System (EWIS) component? This is a straightforward question that should have a straightforward answer, but often, this is an unanswered question. Regulatory guidance such as Fuel Tank Ignition Source Prevention Guidelines from the FAA think of wiring as something […] Read more

Correcting Bad Wire System Guidance

Consider a common aircraft wire: how many requirements and standards must be considered during its design and fabrication? A simple back-of-the-envelope calculation suggests at least 30 various requirements and standards. For an aircraft wire harness, that number can easily jump to 50. Without a doubt, between each of these standards and requirements, there can be […] Read more

Updating Periodic Maintenance Procedures

An area of aircraft maintenance and wire system sustainment which has been around for the last decade is the enhanced zonal analysis procedures, or EZAP for short. EZAP is a set of procedures developed by the FAA during the 2000s detailing a systematic process for handling of wiring system maintenance based on zones. Lectromec has […] Read more

Standard Practice for Maintenance of Aircraft Electrical Wiring Systems

An industry as broad as the aerospace industry will have a variety of standards and recommended practices. The hope is that each standard brings something new through either a higher level of requirements or by providing better guidance to achieve a reliable aircraft. The ASTM Standard F2799 was written with the intention of being, “used […] Read more