MIL-HDBK-525 EWIS overview: Task 6 — Action plan, Part I

December 2, 2013 Michael Traskos

This is a series on MIL-HDBK-525 EWIS Overview. The seventh article in the series on Electrical Wire Interconnection Systems (EWIS) Service Life Extension Programs (SLEPs) develops an action plan and mitigation techniques based on the EWIS risk assessment (Task 5). If you missed any of the articles, here are the links to the previous ones: […] Read more

F-22 crash and aircraft electrical arcing

November 15, 2013 Michael Traskos

In a report that was released August 2013 by the USAF, the results of a Lockheed Martin F-22 aircraft crash point to a chaffed power feeder cable as the likely cause of failure. On November 15, 2012, the F-22, attempting to return to base, crashed just short of a runway in Florida. The crash resulted […] Read more

MIL-HDBK-525 EWIS overview: Task 5 — Risk assessment

November 13, 2013 Michael Traskos

We are presenting an EWIS overview. This is the sixth article in the series on Electrical Wire Interconnection System (EWIS) Service Life Extension Programs (SLEPs). If you missed one, here are the links to be previous articles: MIL-HDBK-525 Overview MIL-HDBK-525 Overview – Task 1: EWIS Documentation MIL-HDBK-525 Overview – Task 2: Data Analysis MIL-HDBK-525 Overview […] Read more

MIL-HDBK-525 EWIS overview: Task 4 — Component assessment

October 26, 2013 Michael Traskos

This is a series that will give you a good EWIS overview. This article is the fifth in the series devoted to reviewing the guidance provided in MIL-HDBK-525 for Electrical Wire Interconnection System (EWIS) Service Life Extension Programs (SLEPs). If you missed one, here are the links to be previous articles: MIL-HDBK-525 Overview MIL-HDBK-525 Overview […] Read more

MIL-HDBK-525 EWIS overview: Task 3 — EWIS assessment

October 11, 2013 Carina Cannon

This is a series that will give you an EWIS overview. This article is the fourth in the series devoted to reviewing the guidance provided in MIL-HDBK-525 for Electrical Wire Interconnection System (EWIS) Service Life Extension Programs (SLEPs). If you missed one, here are the links to be previous articles: MIL-HDBK-525 Overview MIL-HDBK-525 Overview – […] Read more

MIL-HDBK-525 EWIS overview: Task 2 — Task analysis for EWIS

August 30, 2013 Carina Cannon

In order to get a better understanding of wire degradation, this is a good view of task analysis for EWIS. This article discusses the second task “Data Analysis” in the series on EWIS Service Life Extension Program (SLEP). This is based on the new guidance developed by the USAF for the sustainment of aging aircraft […] Read more

MIL-HDBK-525 EWIS overview: Task 1 — EWIS documentation

August 21, 2013 Michael Traskos

This series on EWIS Service Life Extension Program (SLEP) risk assessment techniques discusses the implications and ideas contained in the EWIS handbook MIL-HDBK-525; an overview of the handbook objectives was covered in the MIL-HDBK-525 Overview for Service Life Extension article. Each article in this series will review a task or a subtask within the EWIS […] 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

Minimum bend radius as applied to aircraft wire system degradation

July 26, 2013 Michael Traskos

Constant mechanical strain can and will reduce a wire’s longevity. Knowledge of minimum bend radius can reduce wire system degradation. These stresses can come from clamps that are too tight, over compressed harnesses protection sleeving, or poor routing. One method to reduce this potential mechanical strain in harness routing, is to ensure that all harnesses […] Read more

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