View Latest Blog Entries
Close
Categories
Testing & Assessment Certification Aging Wires & Systems Management Standard & Regulation Maintenance & Sustainment Conference & Report Research Protection & Prevention Arcing Miscellaneous
Popular Tags
Visual Inspection MIL-HDBK MIL-HDBK-525 FAR AS50881 FAR 25.1707 Electromagnetic Interference (EMI) High Voltage Wire System Maintenance Arcing Damage FAR 25.1709
All Tags in Alphabetical Order
25.1701 25.1703 Accelerated Aging ADMT Aging Systems Aircraft Power System Aircraft Service Life Extension Program (SLEP) arc damage Arc Fault (AF) Arc Fault Circuit Breaker (AFCB) Arc Track Resistance Arcing Arcing Damage AS22759/87 AS4373 AS4373 Method 704 AS50881 AS5692 AS6019 AS85485 AS85485 Wire Standard ASTM F2799 ATSRAC Attenuation Automated Wire Testing System (AWTS) Bent Pin Analysis Best of Lectromec Best Practice Cable cable testing Carbon Nanotube (CNT) Certification Chafing Chemical Testing Circuit Breaker Circuit Protection Coaxial cable cold bend comparative analysis Compliance Component Selection Condition Based Maintenance Conductor conduit Connector connectors contacts Corona Corrosion Corrosion Preventing Compound (CPC) Cracking D-sub data analysis data cables degradat Degradation Delamination Derating diagnostic dielectric constant Distributed Power System DO-160 Electrical Aircraft Electrical Component Electrical Testing Electromagnetic Interference (EMI) Electromagnetic Vulnerability (EMV) EMC EMF EN3197 EN3475 EN6059 End of Service Life End of Year Energy Storage engines Environmental Environmental Cycling ethernet EWIS Component EWIS Design EWIS Failure EWIS Thermal Management EZAP FAA AC 25.27 FAA AC 25.981-1C Failure Database Failure Modes and Effects Analysis (FMEA) FAQs FAR FAR 25.1703 FAR 25.1707 FAR 25.1709 fault tree Fixturing Flammability fleet reliability Flex Testing fluid exposure Forced Hydrolysis fuel system fuel tank ignition functional testing Fundamental Articles Future Tech Green Taxiing Grounding Harness Design Hazard Analysis health monitoring heat shrink tubing high current high Frequency high speed data cable High Voltage History Hot Stamping Humidity Variation ICAs IEC60172 Instructions for Continued Airworthiness Insulation insulation resistance IPC-D-620 ISO 17025 Certified Lab Kapton Laser Marking life limited parts life projection Maintenance Maintenance costs Mandrel Mechanical Testing MECSIP MIL-C-38999 MIL-C-85485 MIL-DTL-17 MIL-DTL-3885G MIL-DTL-38999 MIL-E-25499 MIL-HDBK MIL-HDBK-1646 MIL-HDBK-217 MIL-HDBK-454 MIL-HDBK-516 MIL-HDBK-522 MIL-HDBK-525 MIL-HDBK-683 MIL-STD-1560 MIL-STD-1798 MIL-STD-464 MIL-T-7928 MIL-T-81490 MIL-W-22759/87 MIL-W-5088 Military 5088 modeling MS3320 NASA NEMA27500 No Fault Found off gassing Outgassing Overheating of Wire Harness Parallel Arcing part selection Performance physical hazard assessment Physical Testing polyimdie Polyimide-PTFE Power over Ethernet Power systems predictive maintenance Presentation Probability of Failure Product Quality Radiation Red Plague Corrosion Reduction of Hazardous Substances (RoHS) regulations relays Reliability Research Rewiring Project Risk Assessment SAE Secondary Harness Protection Separation Requirements Series Arcing Service Life Extension Severe Wind and Moisture-Prone (SWAMP) Severity of Failure Shield Shielding signal cable silver plated wire smoke Solid State Circuit Breaker Space Certified Wires stored energy supportability Sustainment Temperature Rating Temperature Variation Test methods Test Pricing Testing Thermal Circuit Breaker Thermal Endurance Thermal Index Thermal Shock Thermal Testing Tin plated conductors Troubleshooting TWA800 UAVs verification Visual Inspection white paper whitelisting Wire Ampacity Wire Certification Wire Comparison wire damage wire failure wire properties Wire System wire testing Wire Verification work unit code

Lectromec’s Top 5 Articles of 2016

Miscellaneous

At the end of each year, we look back at the most popular Lectromec articles. This year, Lectromec generated a wide range of content ranging from component testing to protecting fuel tanks. This range of topics was covered in more than published 30 articles, two whitepapers, and presentations on the results of multiple internal research efforts. Here are the top five articles of 2016.

1: High-Speed Footage of Wire Failure Near Fuel Line

This was the most popular article of 2016. And why not? This included wire failure, potential risk to other aircraft systems, and molten metal all captured at 300fps.

Aircraft wire harness arcing failure captured through UV filtered lens at 300fps. A significant amount of copper was transfered from the arcing wires to the fuel tube.
Aircraft wire harness arcing failure captured through UV filtered lens at 300fps. A significant amount of copper was transferred from the arcing wires to the fuel tube.

As with most fields, the more we learn about a particular topic, the better our understanding of its complexity and the finer details involved. Frequent readers of Lectromec’s articles will be familiar with our extensive research on the potential impact of wire failure and electrical arcing. In this article, we shared recent research conducted by Lectromec on an area that received little attention in the past.

2: Introduction to Aircraft Electrical Power Distribution Systems

This article, originally published in 2015, remains one of the most popular articles on Lectromec.com.

The trend in 2015 and still in 2016 has been toward the integration of more electrical components. There are several benefits of the modern design (particularly weight savings). However, as with any airplane design, no system can be fielded before it can be proven safe, reliable, and able to be maintained over the aircraft’s life. In this article, we provided an overview of aircraft power systems and necessary considerations when starting the design process (for a more in-depth discussion of MEA, you can read Lectromec’s Insights from Europe: The More Electrical Aircraft Conference article).

3: Use of Cables on Aircraft – Part 1

Electrical wire cables are an integral part of an aircraft’s Electrical Wire Interconnection System (EWIS). It would be difficult to imagine the design of an aircraft electrical system without the use of electrical cables. The use of cables in aircraft has simplified the formation of wire harnesses and installation of electrical components (think of the ease of installing one cable versus 15 individual wires on an existing platform).

This article is the first part of a three-part series discussing one of the aerospace industry specifications for cables. The series went through many of the necessary design choices for the selection of particular cables (Part 2 and Part 3).

Side Note: This story was also picked up by Wire and Cable Technology International magazine.

4: 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 either through 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 for the maintenance and preventative maintenance of Electrical Wiring Interconnection Systems (EWIS).” This article reviewed the ASTM standard and the knowledge contained can benefit those maintaining an aircraft’s EWIS.

5: Understanding Coaxial Cables

The development and use of coaxial cables have come a long way since their invention in 1880. Improvements in design and reliability have made it a frequent feature for aircraft data transmission applications. In the realm of aerospace, a common coaxial specification is the MIL-DTL-17 coaxial cable standard.

Representative breakdown of aerospace cable.
A cable is a complex system that requires significant attention to detail in design, manufacturing, and use. Are you using the right wire for your application?

There are several parts to the MIL-DTL-17 (currently at revision H) standard of which application engineers and EWIS designers should be aware. Certainly, the requirements of coaxial cables have evolved as the needs of airborne applications have changed (the military Assist website only have revisions dating back to 1983, and this is revision F). This article provided information on what the cables in this standard are, and characteristics that you should be aware of when selecting or maintaining these cables.

Coming in 2017

In 2017, we will continue to cover topics related to EWIS that, we hope, will help to make better designed platforms and more reliable. Feel free to contact us if there are topics you would like for us to cover or expand upon.

Michael Traskos

Michael Traskos

President, Lectromec

Michael has been involved in wire degradation and failure assessments for more than a decade. He has worked on dozens of projects assessing the reliability and qualification of EWIS components. In September 2014, Michael was appointed as an FAA DER with a delegated authority covering EWIS certification.