EWIS regulatory compliance with 25.1707, Part V

February 20, 2014 Michael Traskos

Each of the last four articles has focused on a subpart of the FAA 25.1707 regulation. Jan 20, 2014 Part I: Damage assessment for 25.1707 Jan 28, 2014 Part II : EMI compliance in 25.1707 Feb 7, 2014 Part III: Heavy Current Cables in 25.1707 Feb 15, 2014 Part IV: Grounding and Power Separation Because […] Read more

EWIS regulatory compliance with 25.1707, Part IV

February 14, 2014 Michael Traskos

This article focuses on the grounding and separation of power sources; it is a continuation of a series of articles discussing the Federal Aviation Administration (FAA)’s EWIS certification requirements of 25.1707. If you missed the last couple of articles on this topic, you can see the list below: Jan 20, 2014 Part I: Damage assessment […] Read more

EWIS regulatory compliance with 25.1707, Part III

February 7, 2014 Michael Traskos

This is the third article in this series that is looking at the individual components of Federal Aviation Administration (FAA)’s EWIS regulation 25.1707 and EWIS regulatory compliance. This is part of a series on Regulatory Compliance. If you missed the others in this series, they are listed below: Jan 20, 2014 Part I: Damage assessment […] Read more

EWIS regulatory compliance with 25.1707, Part II

January 28, 2014 Michael Traskos

This is the second article in a series on EWIS Regulatory Compliance. The series is looking at the individual components of the Federal Aviation Administration (FAA) EWIS regulations 25.1707. The first article covered section ‘a’ of the regulations. Continuing the examination of the FAA EWIS separation requirements detailed in 25.1707, this article examines the next […] Read more

EWIS regulatory compliance with 25.1707, Part I

January 20, 2014 Michael Traskos

We will start a series of articles on EWIS Regulatory Compliance. The next couple of articles will discuss some of the finer points of the Federal Aviation Administration (FAA) regulations 25.1707 – System Separation: Electrical Wire Interconnection System (EWIS). Each of these articles will go through an example of an unacceptable scenario and the means to […] Read more

MIL-HDBK-525 overview for service life extension

August 15, 2013 Michael Traskos

The newly published Electrical Wiring Interconnect System (EWIS) Integrity Program Handbook (MIL-HDBK-525) provides a comprehensive method for assessing an aircraft’s EWIS condition for service life extension and ensuring continued airworthiness. There has not been a consistent method by which maintainers have determined the EWIS system health of their platforms, leaving each group to develop their […] Read more

In aircraft wire systems, how much slack should I give a wire?

July 27, 2013 Michael Traskos

Clearly wires shouldn’t be pulled so tight that they are under constant regular strain, but is there some guidance as to how much slack should be provided in aircraft wire systems? One source for guidance comes from the FAA in AC 25.1701. In this advisory circular, the guidance suggests that “EWIS components should have sufficient […] Read more

Understanding wire failure risk levels for aircraft EWIS

October 19, 2011 Michael Traskos

To determine the risk level for each EWIS component, one needs to look at the combination of failure probability and failure severity. This article will review the different levels for of failure probability and failure severity. Read more

Physical and functional EWIS issues included in Rule 25.1709

January 1, 2008 Lectromec Team

The recent set of FAA rules deal with physical and functional EWIS issues. The rules were released for the Enhanced Airworthiness Program for Airplane Systems/Fuel Tank Safety (EAPAS/FTS) places new requirements on system safety and certification of aircraft Electrical Wiring Interconnection Systems (EWIS). These new rules were effective as of December 2007. They are the culmination […] Read more

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